1. power: 2W 2. Rich interface: standard RS-232, TTL, and RS-485 3.Carrier frequency: ... : Carrier frequency: 433, 450, 868, and 915MHz or ISMProvide rich interface: standard RS-232, TTL, and RS-4858CH, expandable for 16 ... system YS-C30M 2-3km range data transceiver ,rf module ,high speed