Bluetooth Solution: 3.0 Valid distance up to 10 meters. Working Voltage: 3.7 V. Standby time: 180 days. Charge with micro USB port. Charging time: 2.5 hours. Battery capacity: Battery lifespan 3 years. Operating temperature: -10 + 55 degrees. Working time with touchpad on: 75 hours. Working time with touchpad off: 360 hours. Fits all 9.7 iPads.