FOUR Mobile 4-CASSETTE-BT 26.31 EUR Available BUY Article Number: 4-CASSETTE-BT Share Information Reviews -Bluetooth 4.2 -Bluetooth frequency range: 2,4-2,48Ghz -Transmission distance: max. 5m -Operating Voltage: USB DC 5V -Working time: +- 10 hours with one charge - charginng cable ( microUSB-USB ) included.