Portland Design Works Gravity+ 100 USB Rechargeable Taillight

The Gravity Tail Light has a built in accelerometer that detects deceleration or swerving and automatically changes to a super bright, solid beam to warn following traffic.

• Battery: 1, 651725 Lithium lon Rechargeable, 3.7(V), 0.814(Wh), 4.423g, Included