【Precise GPS Tracking】Utilizes GPS wireless technology for accurate speed and distance tracking, providing essential ride data for cyclists. 【Powerful 4000mAh Battery】Equipped with a high-capacity 4000mAh battery, this device delivers long-lasting performance for extended rides. Enjoy worry-free cycling without frequent charging interruptions. 【Ultra-Bright Lighting with Multiple Modes】Featuring up to 800 lumens of brightness and 4 versatile lighting modes: single light, dual strong light, dual weak light, and flashing, this bike light ensures visibility and safety in any environment, day or night. 【Loud 120dB Horn with 3 Sound Modes】Stay safe and heard with the built-in 120dB horn, offering three switchable sound options to suit various traffic situations. Alert pedestrians and vehicles with confidence wherever you ride. 【User-Friendly Controls】Dual-line control and button operation allow quick, hassle-free controls during riding. Specifications: Battery capacity: 4000mAh Light weight: about 168g Lumen: about 800LM Size: 108*52*30mm Horn: 120db (3 sounds can be switched) Control: dual-line control + button Lighting mode: single light/dual light strong light/dual light weak light/flash