[TWO MOUNTING OPTIONS & ALUMINUM ALLOY] XliteBT bicycle back light offers two quick-release mounting options: seat post and saddle, suitable for most bikes, allowing easy and fast installation.With an aluminum alloy body, it's sturdy and durable, featuring IPX6 waterproof and shock resistance, easily handling harsh conditions to meet your cycling needs.<br>[ANTI-THEFT ALARM FEATURE]The XliteBT rear bike light,High-lumen COB light, high visibility & anti-theft. detects movement or vibration and triggers a high-decibel alarm,remote alarm Horn,scare off thieves and protect your bike.<br>[67HRS BATTERY LIFE AND 5 MODES ]The XliteBT tail light has 13-67 hours of ultra-long battery life,750mAh large capacity rechargeable battery, low battery reminder for charging, charging time: 2-3 hours to full, supports USB-C, 6 lighting modes: long on, flash, slow flash, strobe, breathing flash.<br>[WHAT YOU WILL GET]XliteBT smart taillight *1,USB-C cable*1, saddle mount *1, seat post mount *1, rubber straps *2, zip ties *4, user manual. ● provides a 12-month product protection plan and a 30-day free return/exchange policy after purchase. If you have any questions, please contact us for excellent customer support and service.<br>[SMART BRAKING]XliteBT smart taillight features automatic on/off,It automatically turns on when motion is detected,It automatically turns off after 10 seconds of inactivity,Click once to switch light modes,double-click to switch between automatic/manual modes.