Features: 1)wireless communication: Bluetooth SPP Profile 2)transmission bandwidth: 2.400GHz to 2.4835GHz (79 channel; Frequency Hopping ) 3)connection distance: Farthest up to 7M 4)continuous use time: 2pcs AAA battery up to about 90 hours averagely 5)Standby Time: About 300 hours 6)keystoke quantity: 65pcs 7)Key space between: 18mm(level direction). 17.2mm(vertical direction) 8)Size: 300*105*13.5mm(unfold ) 150*105*19.7mm(Fold) 9)weight: 180g (without battery) 10)heat resistance: 65 centidegree 11)electricity consumption: 12mA(Under operating mode), 1mA(under Sleep Mode) Our tenet: Mikosi Technology will do best for you. Supply best complete, best PDA Ipod and mobile phone accessories. Our products: *Mainly supply mobile phone, pda, ipod accessories. For example charger, stylus/pen, cable, leather case, silicon case, metal case, car holder, cradle, battery.