M-Wave Helios K 1.1 USB SL

Compact Rear Light with All-Weather Visibility The M-Wave Helios K 1.1 USB SL is a rechargeable LED rear light built for reliable visibility in any condition. Its bright, forward-facing beam delivers 240-degree visibility to riders approaching from behind, while a single lithium polymer battery keeps the light running steadily for up to four hours on a single charge. USB charging means no batteries to buy or replace, and a battery level indicator shows charge status at a glance. Quick toolless mounting fits seat posts and frame tubes from 19 to 31.8mm in diameter, with five-step vertical adjustment to aim the beam exactly where you need it. A universal rubber band bracket clips onto most seats or tubes without tools, and water protection sealing keeps the light working through wet weather. The compact plastic and rubber construction weighs just 11 grams, adding minimal weight to your bike. Smart and Practical LED light provides consistent brightness with a 4-hour runtime per charge. Lithium polymer battery is rechargeable via included USB cable, eliminating disposable batteries. Battery level indicator and charge control indicator show remaining power and charging status. 240-degree visibility window ensures rear-facing riders and approaching traffic see the light from multiple angles. German safety approval number confirms compliance with regional lighting standards. Toolless clip-on mounting works on seat posts, frame tubes, and seatbacks. Five-step vertical adjustment aligns the beam for optimal visibility. Universal rubber band bracket accommodates posts and tubes from 19–31.8mm diameter. Water protection sealing resists rain and splash conditions. Lightweight design at just 11 grams minimizes weight penalty.