Allowing channel switching according to preset channel plan, 1.6 x 1.15 x 0.22 in. STD-503 facilitates embedding of wireless capabilities in industrial remote control equipment. Radio communication reliability in 2.4 GHz ISM band is ensured via use of noise-resistant direct-sequence spread spectrum (DSSS) modulation as well as true diversity receiver design employing 2 antennas. Transmitting data at up to 19.2 kps, module achieves low power operation of 10 mW using 3.3 V 65 mA supply.