Usb bluetooth RT-BT-01 1.>Specification: V 2.0 & Interface: USB 2.0 ( 1.1 compatible ) 2.>Frequency band: 2.4 GHz ISM & Receiving sensitivity: ≤ -70dBm 3.>Maximum output: +4dBm (class 2) 4.>Running voltage: 5V & Operating temperature: -20°C to 75°C 5.>Receiving /sending range:10m & Driving disc: IVT 2.6 2.7