- Description
- Specification
- About Femobook
- Shipping & Returns
Electric Single-Dose Performance for Exacting Brews
Quiet yet powerful, with near-zero retention and precision grind control—built for clean, flavourful pour-overs.
The Femobook A4Z is a precision-engineered electric grinder designed to elevate manual brewing with consistent, clean results. Crafted from CNC-machined aluminum alloy and powered by a quiet low-RPM motor, the A4Z preserves the subtle aromatic compounds essential to high-quality pour-over coffee.
Its 48 mm conical burr set—adapted from the acclaimed ZP6 design—offers excellent grind uniformity across a wide range of pour-over settings. The stepless adjustment dial allows for precise tuning, while the magnetic assembly system enables tool-free disassembly and effortless cleaning. With near-zero retention and a detachable battery capable of up to 110 brews per charge, the A4Z balances performance and practicality without compromise.
Designed for daily use and demanding brew (competition & research) standards, the A4Z offers consistent, single-dose grinding with minimal retention and no need for recalibration. While not intended for espresso, it excels in pour-over, AeroPress, and drip methods where grind precision and flavour clarity are paramount.
Main Features:
- 48 mm stainless steel conical burr by 1Zpresso (ZP6 Burr)
- Over 3 rotations of grind adjustment, 100 clicks per rotation (0.008 mm per click)
- High-torque, low-RPM brushless motor (~53 RPM)
- Magnetic burr brush reduces retention
- Rechargeable, swappable 6000 mAh battery (30–50 uses per charge)
- Auto-stop after grinding
- Tool-free magnetic assembly for easy cleaning
- Manufacturer warranty & support
- Compatible accessories available
Build & Functionality:
- Housing: CNC-machined aluminum alloy chassis with anodised finish
- Retention System: Near-zero retention via magnetic catch cup and internal burr wiper
- Cleaning: Tool-free magnetic burr assembly with integrated magnetic cleaning brush
- Noise Level: ~60 dB under typical use, significantly quieter than most electric grinders
Included in the Box:
- Femobook A4Z Electric Grinder (with pre-installed bean funnel and battery pack – 3x 18650 cells)
- USB-C charging cable
- Precision cleaning brush & air blower
- Printed user manual
- Carry case for storage and transport
Charging & Battery Guidance
To help ensure safe operation and long-term battery performance, always follow the charging instructions provided in the original user manual.
The manufacturer recommends using only a 5V / 1A USB charger that complies with applicable safety standards. Please do not use fast chargers or chargers with high-output power, and always charge the grinder with the original USB cable supplied with the product.
For users who need a replacement, compatible 5V / 1A chargers and replacement battery sets are also available to purchase in our shop.
Femobook A4Z Electric Grinder Review┃Ito Atsuomi
It brings out a seductive, captivating aroma and delivers a smooth mouthfeel.
- Colour: Champagne gold / Black
- Dimension: 130*60*245 mm
- Capacity: 30±5g
- Weight: 2.6±0.2kg
- Battery: 18650 / 10C, 2000mAh*3
- Type: Type C to USB
- Burr Size: 48 mm
- Rated Speed: 53.7±12% RPM
Use only a 5V / 1A USB charger that complies with safety standards. Do not use fast chargers or chargers with high-output power.
Effortless Grinding Without Compromise
Femobook is a young and ambitious company from Taiwan, founded in 2022, that’s redefining what it means to grind coffee at home. Specialising in electric coffee grinders, Femobook focuses on creating tools that cater specifically to specialty coffee lovers—those who care deeply about flavour, consistency, and ease of use.

Born from the Specialty Coffee Movement
With the global rise of specialty coffee, both the quality of beans and the complexity of processing methods have evolved rapidly. Femobook was founded in response to this shift, recognising that coffee equipment must advance in step with the beans themselves. Their grinders are designed to help users fully experience the unique flavours that specialty coffee offers—making high-quality brewing more accessible to more people.
Solving the Problems Most Grinders Ignore
Femobook sets itself apart by addressing the everyday frustrations of both hand grinders and conventional electric grinders. Many coffee enthusiasts face issues like:
- Inconsistent grind sizes
- Tiring and slow manual grinding
- Difficult cleaning and maintenance
- Inflexible grind settings that don’t meet espresso standards
Femobook's products are built specifically to overcome these challenges, with an emphasis on convenience, precision, and user experience.
Smart, Thoughtful Design – Down to the Details
Every detail in a Femobook grinder reflects thoughtful engineering. Key features include:
- Magnetic quick-release systems for effortless disassembly and cleaning
- Stable motor design and balanced weight distribution for consistent grinding
- Intuitive controls and fine-tuning capability, especially for espresso lovers
Their grinders are made not just to perform well, but to make the daily coffee ritual smoother, faster, and more enjoyable.
What’s in a Name?
As a Taiwanese brand, Femobook has infused its name with creativity and cultural flair. The name “Femobook” (Fe-mo-boo-k) is a playful phonetic pun in Mandarin, and it can be interpreted in several meaningful—and coffee-related—ways:
飛磨不可 – Flying grind
"We believe that each cup of coffee is a journey beyond the ordinary."
啡磨不可 – Grinding perfectly
"Every cup of coffee represents a wonderful moment."
非磨不可 – You must grind it
"An essential coffee grinder that you can’t live without!"
Each interpretation reflects Femobook’s philosophy: coffee is more than just a drink—it’s a daily ritual, a moment of joy, and a way to connect.

Official Overseas Dealer of Femobook
We are proud to be an authorized overseas dealer of Femobook products. When you purchase through us, you receive the same high-quality support and warranty coverage provided by the manufacturer in Taiwan:
- Genuine Femobook products
- Manufacturer-backed warranty
- After-sales support in the EU
Enjoy effortless grinding without compromise, backed by service you can trust.
Shipping
Order Processing
Orders are processed and dispatched Monday to Friday, excluding Dutch public holidays.
Once your order has been dispatched, you will receive a shipping confirmation with tracking information where available.
Delivery times shown below are estimates after dispatch and are not guaranteed. Delays caused by carriers, customs clearance, local authorities or other circumstances outside our control may occasionally occur.
Estimated Delivery Times
Netherlands
Usually 1–2 business days after dispatch.
Europe
Usually 1–5 business days after dispatch, depending on the destination.
United States & Canada
Usually 4–14 business days after dispatch.
Orders Outside the European Union
Orders shipped outside the European Union, including orders to the United Kingdom, may be supplied without EU VAT where applicable.
Import VAT, customs duties, brokerage charges and other local import fees are not included in our prices or shipping charges unless explicitly stated otherwise at checkout.
Any such charges imposed by the destination country are the responsibility of the recipient.
Customs procedures may also extend the estimated delivery time.
Incorrect or Incomplete Delivery Address
Please check your shipping address carefully before completing your order.
If a parcel is returned to us because of an incorrect or incomplete address, refusal of delivery, or failure to collect the parcel, additional shipping costs may apply before the order can be sent again.
Returns
14-Day Right of Withdrawal – EU Consumers
If you are purchasing as a consumer, you normally have the legal right to withdraw from an online purchase within 14 days without providing a reason.
The 14-day withdrawal period starts on the day after you, or a person designated by you, receives the goods. If one order is delivered in several shipments, the period starts after receipt of the final item.
To exercise your right of withdrawal, please inform us within this 14-day period through our online withdrawal function or by contacting us at info@kohiraifu.com and clearly stating that you wish to withdraw from your purchase.
Please include your order number whenever possible.
After notifying us of your withdrawal, you have a further 14 days to send the goods back.
Return address:
Kohiraifu
Noordkade 68
2741 EZ Waddinxveen
Netherlands
For change-of-mind returns, the direct cost and risk of returning the goods are the responsibility of the customer. We strongly recommend using a tracked shipping service and keeping your proof of shipment.
Condition of Returned Products
You may inspect a product to the extent reasonably necessary to establish its nature, characteristics and functioning, similar to what would normally be possible in a physical shop.
Please return the product complete, including its accessories and, wherever reasonably possible, its original packaging.
If a product has been handled or used beyond what is reasonably necessary to inspect it and this results in a reduction in value, we may deduct the corresponding diminished value from the refund.
Refunds During the 14-Day Withdrawal Period
For a valid withdrawal of the complete order, we will refund:
- the purchase price of the returned products; and
- the cost of our least expensive standard delivery option originally available for the order.
Additional delivery charges resulting from choosing a more expensive delivery method, such as express shipping, are not refundable.
If only part of an order is returned, the original delivery charge is not refunded.
The direct cost of returning the order to Kohiraifu is the responsibility of the customer unless the product is faulty, damaged, incorrect, or we have agreed otherwise.
Refunds will be made using the original payment method. We may withhold the refund until we have received the returned goods or until you provide evidence that the goods have been sent back, whichever occurs first.
Voluntary Returns – Up to 30 Days
In addition to your statutory rights, Kohiraifu may accept eligible products for return for up to 30 days after delivery.
Returns requested after the statutory 14-day withdrawal period are part of our voluntary return policy and require prior approval.
For returns between day 15 and day 30:
- The product must be unused, complete and in resalable condition, preferably with its original packaging.
- The customer is responsible for the return shipping costs.
- Original shipping charges are not refundable.
We reserve the right to decline voluntary returns that do not meet these conditions.
This voluntary return policy does not limit any statutory consumer rights.
Coffee, Matcha, Food & Consumable Products
Certain statutory exceptions to the right of withdrawal may apply to products that deteriorate or expire rapidly, or to sealed products that are not suitable for return for health or hygiene reasons once their seal has been broken.
Opened coffee, matcha, food products and other consumable products cannot be accepted under our voluntary return policy once opened or used.
This does not affect your rights if the product supplied is faulty, damaged, incorrect or otherwise does not conform to your order.
Damaged, Faulty or Incorrect Products
If your order arrives damaged, faulty, incomplete or different from what you ordered, please contact us as soon as reasonably possible at info@kohiraifu.com.
Please include:
- your order number,
- a description of the issue, and
- photos or video where this can help us assess the problem.
Please keep the product and its original packaging until we have reviewed the case.
Where the product is confirmed to be faulty, damaged or incorrectly supplied, Kohiraifu will arrange an appropriate solution and cover reasonable return shipping costs where a return is required.
Your statutory warranty and conformity rights are not affected by this policy.
Exchanges
If you would like a different product, colour or variation, please contact us first.
Depending on the product and stock availability, we may arrange an exchange or ask you to return the original product and place a new order.
Wholesale & Business Orders
The statutory consumer cooling-off period does not apply to purchases made for business or professional purposes.
Wholesale and other B2B returns are therefore subject to separate conditions and require prior written approval from Kohiraifu.
This does not affect claims relating to products that were damaged, faulty or incorrectly supplied.
Questions About a Return?
Kohiraifu
Email: info@kohiraifu.com
Phone / WhatsApp: +31 (0) 6 27 56 08 25
Please include your order number so that we can assist you more quickly.









