ISM band. Low-cost RF modules RF data rate 1200-19200bps. Interface UART/TTL, RS-232, RS-485 optional Product Description: FC- ... ,<35mA/RS485,<35mA/RS2328) Sleep current: 25uA9) Cgannel spacing:25kHz10) Interface: UART/TTL,RS-232,RS-485,Baud rate: 1200-19200bps ... °C 14 )Size:40mmx27mmx6mm 15) Weight: 10g rs232 rf communication modules FC-221AP