Patented seatpost with an integrated seat rail clamp. The seatpost tube features 5 holes in which the LEDs are enclosed.
Seatpost-S's USB 2.0 charging port is in the lower section of the seat rail clamp. The port is accessible from the outside and can be closed using a transparent silicone cover.
S311E or S311D’s cable with a connector extends out of the lower end of the seatpost tube for connection to the electrical system of the e-bike or the bicycle dynamo.