This means that ADHD One can only be used when the paired smartphone is within Bluetooth range. This makes the phone practical only for use at home or in the office, but hardly suitable for use on the go. A future revision is intended to change that, as the developer is already working on an ADHD with an integrated 4G modem that has its own phone number and can access the cellular network directly.
Pricing and availability
Anyone who wants an ADHD One will have to build it themselves. The developer does at least sell the required STL files for the 3D printer, a list of the required components, and the accompanying firmware for €29.99 ($34). The required electronic components must be purchased separately.