YS-C30M 2W Data transceiver Product Description Carrier frequency: 433, 450, 868, and 915MHz or ISMProvide rich interface: standard RS-232, TTL, and RS-4858CH, expandable for 16/32 channels according to requirements of customersBaud rate: 1,200, 2,400, 4,800, 9,600, 19,200bpsInterface format: 8N1/8E1 user-defined or customization for other..