Bluetooth usb dongle 1. class 2, operation range up to 20m, 2. ISSC Chipset, ESI, 3. Bluetooth v2.1+EDR 4.Crystal casing 1. Crystal casing Bluetooth usb dongle:2. Operation range: 20 meters (class 2) or ... : blue, red, white, black12. Net Weight: 7g; Gross Weight: 41g Hot! (Class 1/2) Bluetooth usb dongle,