Buying Guide

You have two options:

  1. Buying an assembled device: Buy Assembled Device

  2. Assemble the Device yourself with off-the-shelf components:

Item Where To Buy Unit Price
Seeed Studio XIAO nRF52840 Sense Board $15 on Seedstudio and $24 on Amazon US, Amazon EU and India <$15/unit
Rechargeable Battery $7 on Amazon US $7/unit
Slider Switch $8 for 30+ units Amazon US SS12D00 and also Amazon EU and Amazon UK but you only need one <$1/unit
Wires Amazon US  
Case 3D-print design of the case  

Next Step: Build the device →