Specification: Size:111.6*30*33.8 mm Color:Black Weight:220g Package Dimension:9.3*12.8*5.4 CM Charging input:DC 5V 1A Waterproof rating:IPX4 Turn signal battery capacity:2200MAH Remote control battery capacity:180MAH Red warning light brightness:85 lumens Wireless transmission mode:433M Working environment:-20-60 degrees Celsius Powered by:Built-in rechargeable battery Package includes: 1*Bicycle taillight 1*Remote control(with fixing screws) 1*Fixed bracket 1*USB data cable 1*instruction manual 2*rubber pads Features: USB convenient charging,can be used when charging,and lasting longer. IPX4 waterproof,windy and rainy weather,can also be used as usual. Fixed buckle installation,easy to disassemble,can be carried with you,safe and convenient. Equipped with wireless remote control,you can switch modes at will,convenient and practical. It is suitable for night riding,not only to ensure safety,but also to decorate bicycles. Note: When this product is not used for a long time, please charge it at least once within 3 months, otherwise the battery may not be fully charged. The waterproof grade of this product is IPX4, which can be used in light rain, but please do not soak the product in water. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Please allow slight manual measurement deviation for the data.