Color: black Interface: USB1.1/2.0/3.0 Button life: 2000000 Maximum distance: up to 15 meters when unobstructed Smart mobile system supported: iPhone OS 4.0+ (iPhone, iPad), Nokia Symbian S60+, Windows Mobile 6.0+, Android 2.3+ Compatibility: Windows 2000, XP, Vista (32-bit) Power source: built-in rechargeable li-ion battery Transmission power: Class 2 level Working time: 8hours per day sustainable 30days Suitable for PC and laptop with Bluetooth function: yes Port: mini USB for charging Approved: CE, BOB, ROHS Folded Size: 126*85*15mm Unfolded Size: 246*83*8mm This product supporting system include: Computer system: Win2000/me/xp/vista/7/8 Smart phone, Tablet PC system: Symbian system:Symbian S60 V3 V5 Microsoft system: Windows mobile 6.5 WP7/8 Apple System: ISO4 or above version Google system Android 3.0 or above version