Hands Free lets you keep both hands on the wheel, both eyes on the road and access three siren tones and On/Off. Scan-LockTM feature lets you choose from 17 siren tones to preset during siren installation. A compact, self-contained unit that is backward compatible to the 295HFSA1 and slightly shallower in design for underdash/console mounting. Now you can access siren tones using the Scan-Lock feature or check on/off status of your siren via an icon on your video system. 295SLS Series sirens are full function plus radio repeat and public address.