SMAKN&reg; RS232 Bluetooth Serial Adapter Communication Master-Slave 2 Modes 5v mini usb *Standard: Bluetooth SIG v2.1 + EDR; *Bluetooth protocol: Bluetooth serial port profile (SPP); *Interface Interface: RS232 *Communication speed: 1200,2400,4800,9600,19200,38400,57600,115200,230400,460800,921600,1382400bps; *Modulation: 2.4G ISM Direct Sequence hopping (FHSS); *Communication distance: open space 15 meters, Class 2 level *Transmit power: 4 dBm; *Receiving sensitivity: -79dBm; *Operating voltage: 5V *Operating current / Sleep Current: 40mA / 1.6mA (typ); *Operating ambient temperature / Storage temperature: -10-50  C / -20-80  C; *Size: 56.5mm * 38.5mm * 14.5mm