The best way to stay visible during cycling on the roads during the dark nights and winter evenings, the signal is to use. It is a very secure and smart system than the traditional 'arm' method. Thanks to the control of the lighting of your handle bars allows you to make the left or right arrow on the back of the LED lights. This bright light to drivers and pedestrians your intentions and you can be sure. It is fitted with two brackets required to position it on the bike and requires just 3 x AA batteries for operation.P1: Please the dark winter nights. : P2: transmits both wireless with a range of 3 metres (Great when man with a Quandem bike... 4 seats.): P3: Bright LED arrow and even a warning flash lights: P4: Contains the bracket for front and rear lamps, very easy to fit on your bike: P5: requires 3 x AA batteries.