Note: This is bluetooth keyboard, need pair bluetooth with your device . There is no USB receiver . Specification Operating distance: up to 10 meters Modulation system: GFSK Operating voltage: 1.8-3.0V Working current : 2.5mA Standby current: 0.3-1.5mA Battery: 2 * AAA battery (not included) Key strength: 60 ± 1g Layout : US english (Apple system) Keyboard size : 28.5 * 12*0.5 cm Keyboard weight: 0.3kgs Package: 1 * Bluetooth keyboard 1 * Manual