Brand Letdooo Model SA1EX-2 Quantity 1 Color Black Material Aluminum alloy Color BIN Red Number of Emitters 3 Voltage Input 3.6 V Battery Configuration No Brightness lm Runtime 6h Number of Modes 3 Mode Arrangement Cycle fast strobe fast strobe steady on Mode Memory No Switch Type Forward clicky Switch Location Front Flashlight Mounting Tail Strap Included No Clip Included No Features Can use for 6h; Can be used as flashlight; IPX-7 waterproofcan be used under 1m water; Easy to use; Built-in lithium battery 45mAh; Can rechargeable for more than 500 times; Voltage: 3.6V; Working temperature: 0~40'C; Working humidity: 15%~100%; Suitable seat post diameter: 9mm~36mm (adjustable holder) 24~30mm (fixed holder) Packing List 1 x Tail lights 2 x Holders 1 x Clip 1 x Silicone sheet 1 x Chinese user manual