STD-302Z can be manufactured to various frequency bands / power levels while offering the same superior interference rejection and sensitivity through the use of SAW filter. Discrete design ensures long term availability and as before narrowband FM operation offers benefits such as stable operation at maximum data rate of 9600 bps. In addition, the STD-302Z receive performance has been improved to allow reliable communication in safety critical applications - even during tough RF conditions enabling category 1 (EN 300 220)*1 receiver status to be achieved. Maintaining identical housing and pin layout to STD-302S, shock and vibration resistance has also been improved for applications involving rough handling.