The Presenter Clicker supports a 2.4GHz universal channel and has an effective range of up to 30m (wireless interference may shorten the range of the device). The compact, ergonomic design allows the pointer to be used comfortably. Comes with box, instruction manual, receiver and mini usb charging cable. Functions: Black screen -- Press and hold the page down button Play slides -- Press and hold the page up button Charging -- flashing indicator when charging, indicator becomes solid when fully charged (charge the device when device is unresponsive) Sleep function -- press any button to begin using your device Weight: 31.2g Energy Output: less than 1mw Light Style: Beam light Light Color: Red Battery Power: Built-in Li-ion battery Size: Transmitter:12 x 3 x 2.3 cm; Receiver: 2.4 x 1.2 x 0.5 cm Control Distance: 30M (The effective distance will be affected by the surrounding environment and the battery level)