Rapoo Blade Series E9070 2.4Ghz Wireless Ultra-Slim Keyboard Black (E9070 Black) ultra-slim design of 5.6mm at thinnest, scissor key structure and stainless steel plate, brings you comfortable tactile With Rapoo's latest energy saving technology and power switch , you can use your keyboard without power interruption for up to 24-month Reliable 2.4GHz wireless connection with up to 10M working range Keyboard Wireless Technology: 2.4Ghz RF Keyboard Host Interface: USB Nano Receiver 2x AAA alkaline batteries (pre-installed)