High quality: Shell material: PC engineering plastic + 6063 aluminum alloy. This bicycle tail light equipped with SMD LED uses a high-quality lithium battery, which can be recharged 500 times. Intelligent induction: with intelligent brake detection function. When the product detects that the bicycle is braking, all lights will enter strong light mode to remind cars behind to pay attention, and the strong light will last for three seconds. When the product detects that the bike is stationary for 10 seconds, it will turn off all LED lights and enter sleep state to save battery power. Sensitivity: High performance and high sensitivity acceleration sensor chip . This product uses a special algorithm constant current drive circuit with high brightness and good heat dissipation performance. 5 modes: Multiple modes and brightness are optional. Fast flashing, slow flashing, meteors, windmills, breathing light. IPX65 waterproof: This product has IPX65 protection level, which can adapt to various complex outdoor environments. < p>The product has IPX65 protection level and can adapt to various complex outdoor environments. Step 1: Insert the silicone tape into the back ring of the product. Step 2: Insert the silicone ring into the silicone tape. Step 3: Use your fingers to put the silicone loop on the bicycle seat tube, and with the other hand, pull the silicone strip through the silicone loop and secure it. Step 4: Replace the product to complete the installation. Product size: 4cmx3cm Shipping quantity: 1 set Red color