Description: This bicycle warning light is a necessary tool for you when you biking on the road. Red or White light brighting from this item can be easily seen by other drivers or Passers-by far away. Red light is the best warm color using in frog envrionment. With this lamp, you'll be safer when biking at day and night. Specifications: 240wide light angle, can be view easily by other car drivers. fix it on your front support baryou will also warning Passers-by Quick and easy installation, waterproof. Steady about 50 hours, flash about 150 hours. Modes: Fast flashing, Slowly flashing, Steady Material: Aluminum alloy+silicone Powered by: 2 x CR2032 battery (Included) Suitable for tube diameter: 20-40mm Package Included: 1 x Bicycle LED Rear Light 2 x CR2032 20*2MM 3V Battery Notes: For long time battery consume, light may not turn on ,if this happen,you can change two battery to turn it on