This one is 2016 the newest Wireless and Laser Control Real Light Spescial for Mountain Bikes, with remote control, just one button can turn the direction, the status of the alarming light. And the remote control is fixed in front of the handle bar and tail light receives the signal and turns the direction which is fixed on the rear of the bike. Inside there is rechargeable batteries, so you no need to change the battery cells too often, USB connection to charge directly.