The CC4 backpack turns your Coinkite Coldcard™ Mk4 into a battery-powered portable signing device.
An integrated 850 mAh battery powers your Coldcard™ so you can sign transactions on the go without having to carry around a power bank and USB cable.
Simply slide in your Coldcard™ Mk4 and you're ready to go.
The CC4 backpack retains the slim, compact profile of the Coldcard™.
The CC4 backpack is charged via a USB-C port in the top, and features a USB-C passthrough so you can still sign via USB-C with your computer.
Power to the Coldcard™ is switched on and off via a slide switch on the top of the device.
The SD card slot is still accessible with the case on.
Key features:
- User-replaceable 850mAh Samsung Li-ion battery (part number: AB63446BU) provides hours of use
- USB passthrough allows you to sign with your computer as usual, while charging the device. It is possible to charge the CCmk4 backpack without turning on the Coldcard™.
- SD card slot remains accessible
- Charge status lamp provides feedback about charging state
Orange = plugged in and charging
Green = plugged in and finished charging - Ideal for signing on the go with NFC - can be used with Nunchuk wallet for iOS and Android
- Durable nylon construction
- Slim, compact design adds only 6.5mm of additional thickness to the Coldcard™ - from 8.7mm to 15.2mm
We will be releasing a version of this product for the legacy Coldcard™ Mk3 soon!