ONEU Laser Bike Tail Light, Remote Controller IPX4 Water-Resistance Rechargeable Bike Light, Turn Signals Warning Bike Flash Light, Suitable for City Bike, Mountain Bike, E-Bike Etc SEE AND TO BE SEEN - With an output of 85lm, the rear tail light can be seen from a great distance at night and can even be seen in the daylight, It is visible up to 150 feet away and is visible even in fog TWO LASER BEAMS, YOUR SAFE PATH - The laser function projects two laser lines to your sides to sort of create a visual barrier. Theses "lane" are also very obvious and can also flash! This helps you become even more visible and help cars behind you from getting too close when you are riding your bike at night WITH THE REMOTE CONTROL, YOU ARE A REAL DRIVER - Makes it very easy to turn on blinkers, emergency lights, and the laser guides. The main red light bar sort of fades or slides to the direction you set it to point towards, with the yellow light underneath blinking to indicate your direction. At night, it's definitely visible, and super clear even from a distance RECHARGEABLE AND EASY CHARGING - A micro USB port on the side of the tail light assembly eliminates the need to remove the battery and charge on a separate charging port. Just slide the light off of the bike seat assembly and plug in a cable (provided) to the micro USB port. The USB port has a little rubber cover to keep the port closed and protected when not in use NO TOOLS NEEDED TO INSTALL - The normal way of installing the tail light is with the teeth tie and holds it on the bar that you've installed it on, and the tail light slots into the unit tightly enough that it won't come loose accidentally.The other way is to zip tying the harness around the seat peg, then secure the remote to the handlebars with the rubber retaining band