Specification:Operation frequency: 2.4GOperating distance: Up to 10 metersBattery: 500mAh Operating voltage: 3.3VOperating current: <50mACharging current: <300mASleep current: <1mAColor: BlackMaterial: SiliconItem size: Approx. 14.6 * 9.7 * 1.7cm / 5.7 * 3.8 * 0.7inItem weight: Approx. 113g / 3.98ozPackage size: Approx. 19.1 * 11 * 2.7cm/ 7.5 * 4.3 * 1.1inPackage weight: Approx. 172g/ 6.1ozPackage included:1 * Wireless Keyboard1 * USB Cable1 * USB Receiver1 * User Manual