Features: 1. 78 Keys with 12 multi-function keys. 2. Super slim size, comfortable and ergonomic design. 3. Built-in intelligent power manage software for power conservation. 4. Built-in software solutions with bluetooth human interface device.   Specification Bluetooth Version: Bluetooth V3.0 Working Current: 10mA Standby Current: 0.5-0.6mA Low Voltage Electrical Testing: 3.3V Shutdown Voltage: 3.1V Keyboard Power Supply:2 x AAA Batteries (Not Included) Working range: 10M Keyboard Dimensions:(11.22 x 4.72 x 0.71)" / (28.5 x 12 x 1.8)cm (L x W x H) Compatibility:Desktops, Laptops, Tablet,Smartphone. Package List: 1 x Keyboard