Feature: 1. Built‑in BT communication protocol, no need to install additional drivers, can be used in for Windows systems and non‑graphical operating systems such as for DOS and for Linux. 2. Adopts CSR BT chip that supports BT 2.1 standard. Enhanced BER error rate performance and automatic frequency hopping technology can ensure efficient, safe, stable, and interference‑free communication. 3. Can connect and communicate with BT‑enabled laptops, desktop computers equipped with BT adapters, handheld BT PDAs, BT 4. Transmitting power complies with BT Class2 standard, built‑in high‑sensitivity printed circuit board antenna, stable communication distance up to 15 meters, and wireless data transmission through wall. 5. Need to supply power to the adapter through the Mini USB interface on the adapter, equipped with a RESET button, can delete the stored paired device information, and re‑pair with the new device. Specification: Item Type: Serial Port Module Material: Plastic Operating Standard: BT SIG v2.1+EDR BT Protocol: BT SPP Interface Interface: RS232 Communication Rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 1382400bps Modulation Method: 2.4G ISM Direct Sequence Frequency Hopping (FHSS) Communication Distance: 15 Meters in Open Space, Class 2 Level Transmit Power: 4 dBm Receiving Sensitivity: -79dBm Working Voltage: 5V Working Current/Sleep Current: 40mA/1.6mA (Typical Value) Working Environment Temperature / Storage Environment Temperature: -10-50 Degrees Celsius / -20-80 Degrees Celsius Size: Approx. 56.5 x 38.5 x 14.5mm / 2.2 x 1.5 x 0.6in . Package List: 1 x Serial Port Module