Ultra-Bright LED Bike Tail LightBike rear light has 31 high-end LED lights and a brightness of up to 160 LM, its bright enough to be seen from 150ft away on foggy/rainy day or even at dark night. 5-IN-1 Functions: Warning light/ Brake light/ Turn signal/ Electric bell/ Anti-theft vibration alarm. No Standalone lithium batteries are sold with the product. Wireless Remote ControlInstalled on the handlebar, strong wireless range of about 98ft-196ft, easy to switch the lighting modes of the waterproof bike back light by pressing the 5 buttons on the controller. Total six lighting modes: (Slow Flashing/ Breathing/ Blinking/ Steady Light/ Emergency Light/ OFF). Right/Left Turning Signals LightsRight and left turning signals lights, which can be activated using a wireless remote control. These lights are designed to attract drivers' attention from a considerable distance, helping to enhance your safety when riding in traffic. Additionally, the bicycle light usb is equipped with three electric bells that can be used as a vehicle horn. Auto Brake Light & Intelligent ModeThe bike alarm anti theft rechargeable will highlight to remind the cars and pedestrians behind you when braking. In the intelligent mode( Slow Flashing/ Breathing), the light is automatically controlled to turn on or off according to the ambient brightness and whether to ride or not, which is very intelligent and power-saving. Anti-Theft & Electric Bell FunctionThis bike alarm lock with remote can be used as a bike alarm, when the bike is touched or knocked, will emit up to 110dB alarm sound, scaring away thieves. Cycling taillight also can be used as a bike horn. Loud 110dB with 3 horn tones available. It offers various sounds, including electric horn sound, horn sound, and birdcall sound.