Overview: This small size Bluetooth TTL transceiver module allows your target device to both send or receive the TTL data via Bluetooth technology without connecting a serial cable to your computer. It's easy to use & completely encapsulated.TTL data transparent transfer between a host Bluetooth device. Works with any USB (Universal Serial Bus) Bluetooth adapters. Mini Size. Specification: Default Baud Rate: 9600, 8, 1, n. Coverage up to 30ft. Built in antenna. Power input: 3.3VDC. Weight Approx:5g Size Approx:5 x 3 x 1