["brand new and high quality\nFeatures:\nBrake sensing technology, using ARM32-bit processor, shorten the response for time of braking.\nHigh-power LED, higher visibility.\nBuilt-in 500mAh rechargeable lithium battery, USB type C charging port. Rechargeable, convenient and environmentally friendly\nLow battery indicator: Battery will be run out in about one hour when the only this LED light on.\nCNC aluminum alloy shell: CNC process + surface anodized, scratch-resistant, anti-drop.\nIPx5 waterproof rating design without fear of any bad weather.\nGood compatibility: square for seat tube, round for seat post, etc.\nEasy to install and easy to use.\nBicycle Rear Light Set only,other accessories demo in the picture is not included.\n\nSpecification:\nBattery: 500mAh Rechargeable Lithium Battery\nPower Supply: USB Charging\nFlash Mode: 6\nRuntime: 8-41hrs\nWaterproof: IPX5\nMaterial: Aluminum Alloy CNC\nSize: app.7.85x2.75cm/3.09x1.08in\nColor: Black\nQuantity: 1 Set\n\nNote:\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Contents:\n1 x XfitET\n1 x USB Charging Cable\n1 x Saddle Mount\n1 x Seatpost Mount\n4 x Zip-Tie\n1 x User Manual"]