RF data module with transmission distance up to 500 meters, ... 433 MHz,expandable for 32 channels Features:1) Micro Power RF Data Module2) Nakedness and small size, suit for embedding3) ... hardware, awaken from COM port, awaken from air6) Main APP: wireless meter-reading, order dishes system, queue system, corporeitytest equipment, ... n) Dimensions: 44 x 27 x 8mm (antenna not included) Wireless RF module