The DIY version of the Ollee Watch one, which requires you to already have one of six different supported Casio watch models (including the F-84W, A159W, A171W, and W-59) is available now for $54.99.
The Ollee Watch features an ARM Cortex-M4/M0+ low-power processor with support for Bluetooth Low Energy and a programmable NTAG213 NFC tag (although this is said to only be compatible with the F-91W ...
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