Flashlight Weight: 120g Length: 10.4cm (without enabling the extension) and 13cm (extension enable) Diameter: 3.2cm (head) and 2.6cm (rear) Material: High-quality metal aluminum Battery: 3 x AAA Battery or 18650 battery (Not included) Voltage:3.7VLight Mount/Holder 4cm Diameter for Bicycle 3cm Diameter for Flashlight 24 x 70 x 5mm Bicycle Anti-slip Pad 20 x 68 x 1cm Flashlight Anti-slip PadTail Light 3 Flash Modes: Steady， flashing， strobe light modes. Size: 11*1.5*3.5cm Weight: 50gNotice : 1. About the mini tail light， please remove the protecting plastic barrier inside the battery slot during the actual installation， then the tail light can be used. 2. About the flashlight， you can use 3 x AAA Battery or 18650 battery for the flashlight. When you use 3 x AAA Battery， dont't install the portable 23mm cartrige; when you use the 18650 battery， you must install the portable 23mm cartrige. 3. Both the flashlight and the tail light can only resist in light shower rain. And to save thte battery， please remove the battery if it is not in use.Package Include: 1x CREE Q5 Flashlight 1x Bike light mount holder 1x Tail Light 2x CR2032 Batteries