Compact very bright red LED rear light providing a great 40 lumens. It is hidden under the saddle thanks to the included Duo Fixer, which allows quick and easy mounting and dismounting without tools. It features convenient cable-free charging via a direct plug into a USB port. Allows dual use with Topeak Duo Fixer accessories, including Topeak QuickClick saddlebags, Tubi tools, CO2 hubs and mudguards. Maximum light intensity: 40 Lumen Light source: super bright red LED Battery: 3.7V 160mAh Lithium Ion (integrated) Light modes: Constant - 10 lm (3.5 hrs), Blink - 10 lm (40 hrs), Pulse - 25 lm (20 hrs) Charging: USB-A / 2-3 hrs Input: 5V 500mA Material: engineering grade polymer Mounting: Duo Fixer on saddle rails Compatibility: Topeak QuickClick saddle bags, HybridMaster Mini, FreePack and FlashFender DF Dimensions: 6.6 x 3.5 x 2.7 cm Weight: 30 g Waterproof: IPX 6