Siig - Network Adapter - Serial RS-232 - Black (ID-SB0111-S1) Form Factor: external Interface (bus) Type: Serial RS-232 Dimensions (WxDxH): 3.7 in x 1.3 in x 0.5 in Bluetooth Standard: Bluetooth 2.0 Wireless Transmission Speed: 3 Mbps Indoor Antenna Range: 328-Feet