Features: Ideal for typing emails， chat， and playing games. Pocket size， sleek and slim design. Extended battery life for hours of typing. Compatible with Bluetooth 3.0. 49 responsive， accurate standard QWERTY keys lay out. Built-in rechargeable Li-ion battery Support mobile operating system: Apple iPhone 4.0 version and later， Windows Mobile 6.0 and later， Nokia Symbian V3.0 and later Specification: Frequency band: 2.4 - 2.4835GHz unlicensed ISM band Receiving sensitivity: -75dbm (standard) RF output power: 4dbm maximum Operating Distance: 0 - 10 m Bluetooth Version: 3.0 Battery Duration: Constantly use: about 50 hours Standby: 400 hours Power: Charges by USB Charging time: 3-4 hours Dimensions: 115 x 60 x 7 mm Color: black Directory Instruction: Step 1: Connecting and pairing Turn on Bluetooth on your device， search the bluetooth device then add it. Pair the keyboard with your device Step 2: Complete the pairing progress After complete the whole progress， you can use the keyboard on your device now. If you want to know more， please read the user manual carefully. Unit net weight: 43g Unit packing gross weight: 112g Package included: 1 x Ultra slim mini Bluetooth keyboard 1 x USB cable 1 x User manual