Multifunctional waterproof bike rear light with brake light,smart light detection,makes you more visiblity and convenience during nighttime riding.Wireless anti-theft alarm prevents your bicycle from being stolen easily.And the lound bell helps you find your bike quickly with 50 meters.Good partner for your cycling trip. Features: 4 switchable lighting modes by pressing the buttons on the remote controller,or pressing the power switch of light. (NOTE: You can not switch the lighting modes when the alarm is activated.) The light will automatically turn on during your braking time,provides more safety during nighttime riding. Built-in light sensor,the light will turn off/on the light automatically in bright/dark environment.(NOTE: Only for Fast Flash Mode and Breathing Flash Mode.) When the bike security alarm is activated,it is sensitive to any vibrations,protect your bicycle from thefts. The alarm sound can reach up to 108db,loud enough to alert you and thefts. Just press the button of controller to find your bike quickly. And the remote range: 0-50 meters. 5 switchable sound modes and 3 levels of sound volume adjustment ,provides more conveninece. (NOTE: You can not switch sound mode and sound volume adjustment when the alarm is activated.) Built-in 800mAh rechargeable battery,convenient to recharge with the provided charging cable. 2 mounting brackets of light to easily install on most bike pipe and under bike saddle. IPX5 waterproof offers convenience during rainy days. Come with some hardwares,easy to install, suitable for seatpost with a diameter of 27-32mm. Specification: Material: ABS + PC + Stainless steel Water Resistance: IPX5 Alarm Sound: 105 - 108 dB Remote Range: 0 - 50 meters Brightness: 40 lux Light Size: 50 * 43 * 42 mm / 2.0 * 1.7 * 1.7 in Light Weight: approx. 66 g / 2.3 oz Light Battery: 1* bulit-in 3.7v 800mAh 802633 li-ion polymer battery Remote Controller Size: 58 * 35 * 15 mm / 2.3 * 1.4 * 0.6 in Remote Controller Battery: 1* 12v/27a Alkaline battery (included) Pacakage Size: 139 * 109 * 48 mm / 5.5 * 4.3 * 1.9 in Package Weight: approx. 175 g / 6.2 oz Package List: 1* Light 1* Mounting Bracket for Pipe 1* Mounting Bracket for Saddle 1* Remoto Controller with Bracket (with a replaceable battery) 6* Tie Strap 2* Red Silicone Pad 1* Black Foam Pad 1* Set of Hardware