1The intelligent sensor brake tail light has 8 light modes, suitable for various cases. 2Simulate car taillight shape, the appearance is domineering and fashionable. 3With light sensing control, the tail light will not light up in normal mode under strong light. 4Adopt IPX6 high performance waterproof grade, can be used normally in the rainstorm , does not affect the effect. 5Install the remote control to the wired base, you can press the button to control the left and right turn signal when riding. Item Type: Bicycle Smart Turn Signal Material: ABS+Electronic Components Weight: Approx.261g/9.2oz Taillight Size: Approx. 116x52x35mm/4.6x2.0x1.4in Wireless Remote Control Size: Approx. 42x35x16mm/1.7x1.4x0.6in Control Method: Wireless Remote Control Charging Method: USB Charging Remote Control Battery Capacity: 3V 200mAh Remote Control Battery: 1 x CR2032 Button Battery (built-in Battery) Taillight Battery Capacity: 3.7V 2000mah Taillight Battery: 1 x 18650 Rechargeable Battery (built-in Battery) Renewal Duration (approximately): Long Light for About 20h, Left and Right Flashes for About 5h, Middle Left and Right Flashes for About 5h, Flash for About 6.5h, Slow Flashing for About 45h There Are 8 Light Modes: 1. Turn Left 2. Turn Right 3. Taillights Are Always on 4. Taillights Flash Quickly 5. Taillights Flash to Both Sides 6. Taillights Burst Flash 7. Taillights Flash Slowly 8. Taillights Flash Left and Right Remote Control Base: Wireless Remote Control (wired Base), Wireless Remote Control (wireless Base) 1 x Tail Light 1 x Wired Base 1 x Wireless Base 1 x Rubber Ring (large) 1 x Rubber Ring (small) 2 x Hexagonal Screw 1 x Hex Wrench 1 x Usb Cable 1 x Holder Bow 1 xSeatpostHolder 1 x Seatpost Fixing Ring 1 x Wireless Remote Control When removing the taillight battery, you must see the positive and negative poles of the battery clearly. If you install it upside down, the taillight will be short& 8209;circuited and burned.