Color: Black - Material: Silicone - Key number: 54 - Built-in 400mAh lithium battery - OS system: Windows 98 / 2000 / 2003 / XP / Vista / 7 Mac OS Linux Android PC OS - 2.4GHz wireless audio (speaker + microphone): perfect for Skype Google talk MSN chatting. - Built-in microphone - Backlit for operation in darken room - Plug and play - Working voltage: 3.7V - Charge voltage / current: 5V / 300mA - QWERTY keyboard - Packing List: - 1 x Touch pad - 1 x USB charging cable (95cm) - 1 x USB receiver - 1 x Earphone (2.5mm plug / 100cm) - 1 x Chinese / English manual