Compact and lightweight, easy to install and hang to your backpack or keychain. With low power and full charged remind, in over-charging, over-discharging, short-circuit and temperature protection. Can be powered by computer, power bank or cellphone charging adapter. Very convenient to use. <br><br><strong>Features:</strong> <br>Super bright 4 LED lights.  <br>One soft button with 3 modes: flash in turn, strobe and steady light. <br>Can be powered by computer, power bank or cellphone charging adapter via the USB cable. <br>The light color of the button can indicate battery capacity: yellow light means that battery is under charging and light off means full charged. <br>Comes with a quick release elastic band, easy to install and convenient to carry. <br>Lightweight, mini size, easy to hang on the backpack to be used as a warning light. <br>Keep you safe at night and early morning riding. <br><br><strong>Specifications:</strong> <br>Material: Plastic <br>Light color: Red / White(optional) <br>Light number: 4 <br>Mode: 3 modes <br>Power: Lithium battery <br>Working hour: 4-7 hours (depend on brightness level) <br>Charging time: Approx. 2-3hours <br>Item size: 5 * 3 * 2cm / 2 * 1.2 * 0.8in <br>Item weight: 16g / 0.59oz <br>Package size: 17.5 * 7 * 4cm / 6.9 * 2.8 * 1.6in <br>Package weight: 42g / 1.48oz <br><br><strong>Package List:</strong> <br>1 * Bicycle Tail Light <br>1 * USB Cable <br>1 * Elastic Band