anybody have any ideas of a wearable accelerometer/gyro sensor that is close to ready-to-go out-of-the-box as possible? i'm working on a project with somebody across the country and not quite sure of their circuitry/soldering skills so want to make it simple for them as possible. low-cost a plus.

the closest thing i've come up with is an adafruit feather with a built-in nrf/bluetooth: https://www.adafruit.com/product/4062 and a featherwing 9-dof imu: https://www.adafruit.com/product/4565 and it looks like we'll have to get one of their li-ion batteries too.