Wide and narrow-band programmable channel spacing Available on VHF and UHF models only. Expanded stored voice Records up to 8 minutes of voice message for playback. Silent scan (Dual-frequency model) Scans both channels silently, alerts on either channel. Priority scan (Dual-frequency model) Plays all traffic on Channel 2, alerts on Channel 1. 12 alert tones per channel Supports 8 two-tone pairs and 4 individual long-tone alerts. Programmable Alerts Supports 10 different musical alerts. Function mode announcement (Stored Voice option) Announces programmed operating mode. Certified for hazardous locations Sealed and sturday for rugged conditions