Model Number: KM-2138 Brand Name: Ksmei Key Specifications/Special Features: Wireless remote control with USB dongle2.4GHz transmission up to 15 metersShake in the air, accurately positioning on the screenPlug-and-play function, compatibleStrong anti-EMI function, quickly switch between 16 channelsEffective batter saver, turn into sleep mode for 20 secondsInaction <6ASuitable for PCs, smart TVs, Google's Android systemsPress any key to wake up the remote controlLow-voltage hint function, when battery voltage is below 2V, LED light blinks