Model NO.:BK1015 Description: 1)Keys: 50 Plastic keys 2) Material:ABS plastic , broadcom bluetooth chip. 3) PC system: windows/XP/vista/MAC 4) support systom ;Bluetooth Version: Bluetooth V2.0 5) charging time:2 H 6) Standby time:7 DAYS    continued time :36 H battery capacity :180mAh 7)Case material: ABS 8) Perfect design for iphone 4 9)Battery capacity: 180mAh 10) transmit range:3 meter 11) Packing: 40pcs/ctn,each packed color box 12) OEM service available Specification: Bluetooth specification:Version2.0Class2 Range of Frequency: 2.4GHz Spectrum Operating Votage:3.7Vdc(powered by Li-ion) Standby Current: 1.2mA Operation Current: : <5mA Sleep Current: <0.7mA Unit size:  117.5*61.5*18.5MM Carton size:46*28*42cm N.W.:9.8 KGS G.W.:  10.6 KGS