Specifications BrandROCKBROSProduct NameQ1MAX Rear LightMaterialCNC Aluminum AlloyLamp BeadsRGB LEDWeightAbout 30g with Bracket SizeAbout 34 34 30mmInterfaceType CDurance15 80HoursBattery3 7V 300mAhLighting Modes5 GearsInstallationSeatpost Saddle Bow Dual Installation Features 1 Brand new Q1 color bicycle tail light high brightness safety warning2 Comes with dual brackets for mounting on bike seatpost or saddle 3 Can be used to do bow mounting or seat post mounting 4 Aluminum alloy and plastic material is drop wear resistant higher strength and toughness 6 Light mode auto and manual mode 7 With intelligent brake sensing light sensing vibration start stop warning riding safety 8 Built in 300 mAh Li ion battery with up to 80 hours of battery life 9 USB charging IPX6 waterproof function10 Optical lens high brightness lamp beads effectively keep the light brighter the light is soft and does not irritate the eyes11 Battery indicator 4 indicator lights in the center 12 Weighs only 30 grams super lightweight Package includes 1 xTail Light1 x Charging CableNote Due to the different monitor and light effect the actual color of the item might be slightly different from the color showed on the pictures Thank you Please allow 1 2cm measuring deviation due to manual measurement