Intelligent Brake Taillight: The taillights have a brake detection function. When the taillight detects brake deceleration, the taillight switches to brake light mode. The taillights emit strong light. Improve cycling safety. Smart Induction Tail Light: In slow flash mode and breathing light mode, turn on the rear light switch. If you drive in a dark environment, the taillight lights will turn on automatically.180 field of view degree wide-angle design, the led bike light will make you more visible for other road users in dark night or daytime. Waterproof Taillights: The taillights are IP65 waterproof. On rainy days bad weather, the taillights can be used normally. USB Rechargeable: This is a USB charging taillight. It can be charged via a variety of USB devices. the tail light can work for 2550 hours in different modes. Please charge in time when the power is low. Long-term low power will damage the battery and cannot be recharged. Saddle mounting : It can be mounted under the seat. 4 LIGHTING MODES Operation Modes Run Time: Flash mode: 50 hours Breathing mode: 50 hours Steady on mode: 25 hours OFF: 3 months The steady on mode is the best choice during the day for you SMART BRAKE SENSING The motion brake sensor will work and the ultra bright light will stay on for 3 seconds as brakes and enough to notify the folks behind you that you are braking In Fast Flash and Breathing Flash mode, the lights will auto turn on when detect any movement or vibration and will auto turn off when there is no movement or vibration within 30 seconds in low brightness. The light will auto turn off in high brightness. POWER INDICATOR 4 blue indicator lights Each blue light show 25% capacity Know the battery left in real time No longer worry about forget recharging USB CHARGING Included 30m USB cable, easily fully charged in 2 hours. Unscrews from the mount cap for recharging, more convenient. Could be charging by any USB port device. Color: black, red Size: Lamp 34x38mm Product Include: 1x Warning Light