Description XUEMEI LCD Digital DisplayThe large LCD display guarantees you can read your statistics easily. Multi-functionsSmall Size ,Light Weight,Wireless Waterproof design makes it more convenient and durable.It works well to Measure Speed ,Distance, Riding time,which the serious bicyclist or fitness fanatic wants to go with knowing. Day Night Backlight Green White color to distinguish between Day and Night . Please note the slight rattle sound from device is normal phenomenon, which results from the design of wireless automatic function. Wireless and Waterproof DesignWireless and Waterproof Design Makes It More Convenient and Durable. Never worried about the complex in install the wires on your handlebarswaterproof- design no need to worry about rain, BUT dont put in the rainstorm or stay in water. Power saving Auto on modeAfter no signal inputs of 300 seconds, the screen will go into a standby sleep mode with LCD displays. It has memory function. This cycle computer will automatically wake up when you shake it or any signal is inputted or any button is pressed. Item dimensions L x W x H46 x 46 x 20 millimetres