RF module transmission distance is up to 500m.Offer byte-oriented transparent data adaptable to various use protocol Features:1) RS-232 Mini Power Wireless RF Module(500m)2) Nakedness and small size, suit for embedding3) Narrowband and anti-jamming commendably4) High SINAD5) Saving power model: awaken from hardware, awaken from COM port, awaken from air6) Main APP: wireless meter-reading, order ...