The device has a micro-USB port for data exchange and charging. The manual states that the device is water resistant for immersion in 1 meter of water for up to 30 minutes.

This micro-USB port is protected by an ABS plastic pan-head slotted flat-end screw and a Nylon rubber strap that acts as a water-tight gasket between the screw and the body.

The rubber strap carries the engraved ActiGraph logo.

The plastic screw can be unscrewed using a pry pick or even with your fingernail. The slot is fairly wide. Although the strap is stuck with an adhesive at the other end of the device, it is fairly easy to pull off.

Strap width: 9.6mm

Strap thickness: 1-2mm

Screw diameter: 9.8mm

Screw length: 6.85mm