Tips: There are 4 styles,the Q1,Q3,Q4,WR05.The follwing detail is Q5,If you want check the Q3 deatil,pls clik the picture. Note Strobe and constant light modes can be controlled manually, the WR05 is micro usb charging and ABS plastic material. Products Detail 1.Full 6061 Aluminium alloy chais. 2.Automatically turn on/off depending on the light intensity and motion.3.Automatically switch to sleep mode to save power.4.Seat rail mounting5.Three flash modes.6.20hours+ run time.7.400mAh Li-ion re-chargeable battery.8.TYPE-C charging.9.Battery indicator ( flashes every 6 seconds) 10.Compact and Light weight design (55g). 11.IPx6 Water proof. Smart Light Sensing Using highly sensitive smart sensor chip Able to correctly detect vibration and braking action COB LED +Ensca len High visibility at night but not dazzling Comparison Of Old lamp; New Technology Compared with the old taillights, the new Q5 taillights use more technical quality lamp beads and lenses. Make the light soft, not hurt the eyes, more secure and stable. Old Model-fog Len Low cost, simple proce, soften light by reducing brightne Q5-Optical Len High cost, complicated proce, keep light transparent and bright without glare Old Model-LED Patch Low cost, simple proce and short life More dazzling at the same brightne Q5-COB Inversion High cost, complicated proce Longer life, more stable Softer at the same brightne Brake Sensing-Integrated Accelerometer Q5 comes with a built-in accelerometer/ high performance MCU and powers by the three-level digital filter algorithm which ensure correct detecting a brake Shock Sensing Automatically turn off the lights when there is no vibration for 30 seconds, and turn on automatically when you feel the vibration (Except in constant light mode) Smart Light Sense Built-in light sensor Works in harmony with vibration induction Smart start and stop saves power The strobe and constant light modes are manually controlled and are not affected by the sensing element The SOS and Bright modes are manually controlled and are not affected by the sensing element Battery Indicator The indicator light flashes every 6 seconds, prompting the current battery Switch modes at will Click to switch the flashing mode: Flashing-Breathing-SOS-Shutdown IPX6 Waterproof Design Proper to any abusive environment Compact and Lightweight design