The Bluetooth RS232 adapter supports the Bluetooth V2.1 SPP Class 1 profile. The interface includes the RS-232 communication. There're series of serial converters. Bluetooth V2.1 SPP Serial adapter model list: 1. S2B2232FIV2: RS-232, Internal antenna, Female DB9 2. S2B2232FEV2: RS-232, External antenna, Female DB9 3. S2B2232IV2: RS-232, Internal antenna, Male DB9 4. S2B2232EV2: RS-232, External antenna, Male DB9 5. S2B2485IV2: RS-485, Internal antenna, Male DB9 6. S2B2485EV2: RS-485, External antenna, Male DB9 If you need more information, please don't hesitate to contact the supplier.