MJ-906S is a powerful bike light that uses a high-capacity external battery, while offering 6V-12V compatibility for E-bike power system. It features two super bright, energy-efficient LEDs, with a maximum output of 4500 lumens. It provides 15 possible brightness modes including Daytime Running Light (DRL) mode, to ensure the best performance on all terrains and conditions. We've further improved the taillight's safety features, including side lighting and an anti-glare lens, which improve your view for oncoming traffic. MJ-906S is powered by our latest and most advanced USB-C external battery MJ-6118, consisting of 4 ultra-high capacity 21700 batteries. With a total capacity of 10,000mAh, the 6118 battery can easily power most of your USB devices via the USB-C input/output port. The large silicone power switch stands out in the dark and is easy enough to press even with gloves. The integrated intelligent thermal control system and large-area metal heat dissipation fins keep the MJ-906 running at optimal temperatures, protecting the internal circuitry and maintaining maximum power. When powered by the electric motor of an electric bike, the MJ-906S automatically adjusts its output within a DC voltage of 6V-12V. Compatible via separately available cables with motors from manufacturers such as Bosch, Brose, Shimano and Yamaha.< /p>