2.4g Wireless Mini Keyboard Touchpad Backlight for Smart Tv Samsung Lg Panasonic Toshiba and Pc/laptop The overall dimensions: 152 mmx59mmx12. 5 mm / 6 The battery type: built-in polymer lithium ion batteries Modulation method: RF adopts the model of DSSS, stronger anti-interference ability Operating range: as far as can be up to 30 meters The charging voltage: 4.2 V to 4.2 V, The charging current: &lt; 350 ma