Features 1、Equipped with 5 super bright red LED indicators and 2 light beam design for easy attention at night. 2、The LED indicator and light beam can work at the same time, and the LED indicator and light beam have 4 blinking modes. 3、A "bicycle sign" can be projected behind the bicycle to warn vehicles behind to maintain a safe distance. 4、With adjustable clamp, easy to install and remove. 5、It will automatically shut down after parking for about 5 minutes to reduce power consumption. Item type: Bicycle Warning Rear Lights Material: plastic Shell Color: black red Size: Approx. 8.6x4.9x3.1cm/3.4x1.9x1.2in Weight: Approx. 120g Battery: 2 x AAA batteries (batteries not included) Waterproof level: waterproof for daily life Light color: red The bike bracket fits approximately 20-36mm/0.8-1.4in diameter tube Instructions for use: Two-button design, long press the LED button for 2 seconds to turn on/off the LED light, and lightly press it to switch the 4 blinking modes of the LED light. Long press the LAS button for 2 seconds to turn on/off the light beam, and lightly press to switch the light beam 4 working modes. Package List 1 x Bicycle Tail Light 1 x Installation clip 2 x Gasket