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Tjlss Mini Folding Keyboard, Wireless Bluetooth Keyboard With Touchpad (Color : Black)Keyboard lifespan: 3 millionBluetooth version: 3.0Interface and connector type: BluetoothPower type: lithium-ion batteryLithium-ion battery capacity: 140mAhWorking voltage: 3.7VStandby current: 0.25mAUse key the working current: less than 3mAUse touchpad the worki..