Description: Bright enough to be seen from 150 feet away in foggy/rainy day or even in dark night. Just long press the tail lights to flashing, then use the controller press any button towards the rear light is OK. Built-in large capacity rechargeable battery, can work up to 5 hours after fully charged. IPX4 waterproof level can be used in small to moderate rain in the temperature of in -4~140°F. Suitable for mountain bike, road bike, racing bike, etc. Easy to control the right/left turn signals, securing your safety when riding in traffic. Specification: Type: Rechargeable Bike Taillight Brightness: Red light 10-15 Lumens Battery: 500 mAh Working Time: 4-5 Hours Lamp beads: 4pcs Blue Light SMD, 5pcs Red Light SMD, 30pcs Yellow Light SMD Lifetime: 30000 hours Size: 122x40mm/4.8x1.57in Package Includes: 1 Set Bike Taillight Note: Bicycle light function: 1. Remote Control: A total of 3 buttons 1)The left turn key: Press the left turn button ,the button indicator flashes, and the rear left turn indicator flashes, and then press the button to turn off the indicator light. 2) Right turn key: Press the right turn button, the button indicator flashes, and the rear right turn indicator flashes, and then press the button to turn off the indicator light 3) LED light key: press the LED button, the button indicator is always on ,and the red light in the tail lamp is always on.Press the LED button again, the button light flashes, and the red light in the rear light blinks. Press the LED button for the third time, and turn off the red light on the tail light 2. Tail lights: a switch button, red LED warning light, yellow LED indicator light.