• There are 4 light modes for your choice, (1) Slow Red Flash: the red light keeps on for 3s when braking in daytime,flash+brake light+intelligent 30s on-off at night. (2) Breathing Flash Mode: the red light keeps on for 3s when braking in the daytime, flash+brake light+intelligent 30s on-off at night. (3) Fast Flash Mode: flashing + brake Light on day and night. (4) Steady On Mode: flashing + brake Light on day and night. COB light beads make you more visible, which is more bright at night
• The bike light will highlight to remind the cars and pedestrians behind you when braking to make your safe riding at night
• This smart bike rear light including a motion sensor and Light Sensor, auto off when detects no motion after 30s. Once shake it or detect the bike is moving, the bike backlight will auto-on again. (auto turn on or off in mode 1 or 2). Please choose mode 3 and mode 4 to avoid the light sensor working
• The tail light has built-in 260mAh rechargeable lithium battery and it comes with a Type-C charging cable that can charge from your computer, power bank, etc.
• The waterproof grade is IPX6, which is safe to use even in heavy rain. Made of high-quality ABS+PC material which is more durable 

Specifications:

• Item No.: Q2S
• Material: ABS+PC
• Bead: COB Bead
• Mode: 4 light modes
• Duration: 7H-16H
• Size: 3.8*2.5*3cm
• Weight: about 22g
• Waterproof rating: IPX6
• Battery: 3.7V / 260mAh polymer
• Working Environment: -10℃-60℃