Smart bike tail light with alarm - Not just a bicycle rear lamp, this tail light also functions as a hidden theft preventive bicycle alarm. It uses motion sensor and vibration alarm to deter thieves, with a 110 dB loud alarm for effective deterrence when your bike is parked outdoors. - It provides additional security and peace of mind, with 7 level adjustable vibration sensitivity ranging from light touch to pushing or tapping. Smart Bike Brake Lamp - Automatic Bicycle Brake Lamp powered by an ambient sensor. When you brake, it automatically activates for 2 seconds to alert riders behind you, helping prevent rear end collisions. - Four light modes are available: slowly flashing, breathing, fast flashing, and fixed light, plus an off option. The mode selection is easily done via a wireless remote control. Intelligent automatic opening/closing - The tail light uses a light sensor and motion sensor for automatic operation. In slow flashing and breathing modes, the tail light automatically closes after 30 seconds of inactivity in dark environments and opens again when movement is detected. - In bright environments, it closes automatically to save power. If you need a tail light for daytime use, you can choose quickly flashing or fixed light modes, which do not have the auto-closure function. 2 Installation Methods - Two installation options are provided: a bracket with cable ties suitable for tube frame installation, and zip ties suitable for irregular mounting surfaces. Easy to install and designed as an affordable, practical bicycle accessory.