... to various use protocol Features:1) RS-485 Mini power wireless RF module(500M)2) Nakedness and small size, suit ... hardware, awaken from COM port, awaken from air6) Main APP: wireless meter-reading, order dishes system, queue system, corporeitytest equipment, ... (customized batch order for industrial level)n) Dimensions: 44 x 27 x 8mm (antenna not included) RS-485 wireless module, RS485RF transmitter