A remote control for an electronic device includes a plurality of keys, a power supply, a power control unit, a code modulating unit, and a transmitter. The plurality of keys generates different first electrical signals when actuated. The power supply is operable to power the remote control. The power control unit detects a voltage of the power supply, and generates a second electrical signal when the voltage of the power supply falls below a predetermined value. The code modulating unit generates different key code signals according to the different first electrical signals, and a switch code signal according to the second electrical signal. The transmitter converts the different key code signals and the switch code signal into different wireless signals, and transmits the different wireless signals to the electronic device.