The badge contains a custom pcb with ESP8266, charge controller, accelerometer and sensor hub (temp ,humidity,light and noise level) and wafer 200mAh LiPo battery
The badge attaches to the back of a normal conference lanyard, runs for 4-5 days on single charge (using aggressive power control)
We ran a 100 user trial at the recent WebSummit conference in Dublin -
https://twitter.com/aidan_boran/status/ ... 1728277504
https://twitter.com/raswak/status/661243191081988101