Merek : UGREEN Model : 90545 Material : Plastic shell, Silicone rubber USB Receiver : 2.4Ghz wireless Distance : 15m Operating voltage : 1.5V Operating current : 40mA Connectivity : Wireless 2.4Ghz Click button : 6 Mute buttons. 3 million time lifespan 5-level DPI : 800/1000/1600/2000/4000, The default setting is 1600 System : WIndows 7/8.1/10/11, Mac OS 10.5 or later, Linux, Chrome OS Battery : 1x AA Battery ( NOT INCLUDED)