Product Dimensions : 15 x 2.16 x 2.36 inches (380 x 55 x 60mm)
Product Weight : 0.88 pounds (400g)
Shipping Weight : 1.14 pounds (520g)
Shipping Dimensions : 16.53 x 2.24 x 2.36 inches (430 x 60 x 70mm)
s321 Specificastion (Lithium-Polymer Battery)
Diameter : 27.2mm, 30.9mm, 31.6mm
Length : 350mm
Color : BLACK, SILVER
Material : AL6061
Light module : 5LEDs
Power source : integrated Lithium-polymer battery 3.7V, 800mAh, 801473 with protection circuit
LED : 5 high brightness LEDs, Non-protruding
Running time : (Minimum) 10 hours - continuous 5LED mode / (Maximum) 50 hours - sparkling mode
Power : 1×Lithium-Polymer(750mAh) intergrated
Waterproof : Waterproof for everyday life
Modes : 8 modes(chase, flashing, sparkling, continuous)X2
Functions : Low battery alarm, Battery protection circuit
S321 How to use
On/off & Mode control switch : The second LED from the top also acts as button to turn the lights on and off and to change between the 3- and 5-light
Push and hold for 2 sec : change between the 3 and 5 light
Mode change : single push
- On → Chase → flashing → sparkling → continuous →Off

S321 Charging
The Lightskin seatpost LED module's USB 2.0 cable can be connected to a laptop or smartphone charger for charging. The USB plug is located under the Seatpost and the Seatpost should be removed for charging.
Hours for full charge : 2.5hr
Battery Running time : Max100hr(3LEDs/Flashing & Sparkling) / Min 10hr(5LEDs/Continuous)
Low Battery Alarm : 3rd Led lights up blue once there is one hour of battery time remaining.
During charging : blue light flashing
Completed charging : turns to blue continuous
*When the battery is fully discharged, the blue LED may not flash when charging. In this case, charge the battery for 2~3 hours even if the blue LED does not flash.