Specifications:Material: ABS (keyboard); PU (case)Executive standard: Bluetooth V3.0Operation distance: 10 metersModulation system: FHSS 2.4GTransmitting power: Class 2Operation voltage: 3.0-4.2VWorking current: <3.0mAStandby current: 90uASleeping current: <6uACharging current: ?200mAStandby time: 90 daysCharging time: 4-4.5 hoursUninterrupted working time:30 hoursLithium polymer battery Capacity:180mAhLithium battery battery life: 3 yearsKey life: 5 million strokesKey strength: 80 �� 10gOperating temperature:-10~+55Storage temperature:-40~+70Humidity:20%~50% Compatible with:For Samsung galaxy Tab Pro 8.4 Inch T320 Package includes:leather case with keyboard x 1USB Charging Cable x 1Instruction manual x 1