HIGH QUALITY: Case material: PC Engineering Plastic+ 6063 Aluminum Alloy. This SMD LED equipped bicycle rear light uses high quality lithium battery, the number of charges can reach 500 times. INTELLIGENT INDUCTION: With intelligent brake detection function. When the product detects braking behavior on the bicycle, all the lights will switch to strong light mode to remind the rear cars to pay attention, and the strong light will last for three seconds. When the product detects that the bike is idle for 10 seconds, it will turn off all LED lights and go to sleep state to save battery power SENSITIVITY: The high-performance, highly sensitive acceleration sensor chip. With special algorithm constant current driver circuit, this product has high brightness and good heat dissipation performance. 5 MODES: Multiple modes and brightness are optional. Quick flash(4.5h),Slow flash(18h),Meteor(9.5h),Windmill(12h),Breathing light(4.3h). IP64 WATERPROOF: With IP64 protection level, this product can adapt to all kinds of complex outdoor environments. Gently touch the button to switch modes: fast flash-slow flash Meteor-Windmill-Breathing light,circular; Turn on the light: In the OFF state, gently touch the switch, the light will be turned on between the mode before the last turn off the Light. Turn off the Light: Long press the switch for 1 second, the Light will turn OFF.