the backlight function: opening the backlight function, you can operate it lightheartedly in darkness. plug and play: 2.4g wireless connection via usb receiver, just plug and play, enjoy long-range wireless control up to 10 meters. voice control: with built-in microphone, it supports voice control function, more convenient to use.  gyroscope function: the gyroscope function enables it to sense the change of the direction and speed, and move it directly in the air to control the devices. ir learning: support infrared learning function, and only the power button of this smart remote can learn the code from other remotes. note: powered by two aaa battery (not included), please buy batteries yourself. specifications: transmission & control: 2.4ghz wireless valid distance: up to 10m sensor: 3-gyro + 3-gsensor amount of keys: 24 battery: aaa * 2 (not included) microphone: yes material: plastic color: black item size: 15.5 * 3.5 * 1cm / 6.1 * 1.4 * 0.4in item weight: 47g / 1.7oz package size: 16 * 5 * 1.8cm / 6.3 * 2.0 * 0.7in package weight: 60g / 2.1oz package list: 1 * air mouse 1 * usb receiver 1 * english user manual