ANTI-THEFT ALARM: The cycling security alarm emits a loud 115 dB sound to attract attention and deter thieves. With a remote control operating range of up to 50 meters (164 feet) in open areas, you can easily locate your bike using light or sound alerts. SMART BRAKE SENSING & LIGHT PERCEPTION: Equipped with a brake sensor, the automatic ultra-bright brake light activates when braking. The bicycle light is highly visible from a distance, enhancing rider safety. In low-light conditions, the taillight turns on automatically. When exiting a dark environment and no vibration is detected, the taillight turns off automatically. MULTIFUNCTIONAL REAR BIKE LIGHT: Easy to install and designed with a built-in alarm, COB LEDs, and a 200-degree wide-angle design, this LED rear light increases visibility for other road users during both night and daytime riding. Enhances safety in various conditions. Can also be used as a helmet light, backpack light, or warning light. IPX65 WATERPROOF & USB RECHARGEABLE: Rated IPX65 for water resistance, suitable for use in rain or splashing conditions. Features an 800mAh polymer lithium battery and includes a USB charging cable. Charges via computer, wall charger, power bank, or any USB-enabled device. After a 3-hour charge, the light operates for 20–40 hours depending on mode: slow flash (40 hours), breathing flash (30 hours), steady on (20 hours). Model: A8 Remote Control Battery: 12V/27A Alkaline battery Color: Black Material: ABS + PC + Stainless Steel Dimensions: Light – 50 x 43 x 42mm; Remote Control – 58 x 35 x 15mm Package Contents: 1 x Host Unit with Taillight Bracket 1 x Remote Control 2 x Mounting Brackets 1 x Plastic Strap 1 x Square Gasket 1 x USB Charging Cable 2 x Installation Tools (Large + Small) 1 x Instruction Manual (English and Chinese) Note: Lighting and display differences may cause slight variations between the product color and the image shown. Measurement tolerance is +/- 1–3 cm.