The EWM-900-RS232 is a full-duplex RS-232 data transceiver. That means that information can be sent and received simultaneously. Half-duplex designs cannot transmit and receive at the same time. Therefore, they achieve lower effective data rates when compared to a full-duplex design.
Features and specifications include operation in the license free 902 - 928 MHz ISM band, 40 channels for robust operation, full-duplex audio and data communications, 19.2 Kbps data link, 3 V DC operation, 40 mA RX current consumption, and 30 mA TX current consumption. Output power is 0 dBm, and AGC maintains linearity for varying receive signal strength. A direct-conversion receiver eliminates image frequency interference. The device measures .98× 2.5× .55.