Works amazing worth the money great quality

I definitely do NOT use this to embarrass my kids when dropping them off off at school. The PA has come in handy more than I though it would.

Has all of the sirens. Very legit.
Have to cup the mic in order for it to speak loudly. That's the only disappointment because I bought it for the PA, not the sirens.
Does not come with the required 15amp fuse to the battery. You have to go out and buy that on your own

OVERALL
The control box seems to be larger than it needs to be, causing a mounting issue. I was able to find a place, but not where I initially had hoped to mount the unit. Buttons, switches, and knobs seem very sturdy. Wiring is great - easy to hook up if you have a little experience with automotive electrical systems. The backlit selected Mode titles are a plus, but not having any other functions/switches backlit is a bit of a bummer, especially with how small the volume indicator is on the knob.

HORN
The Horn is why I bought the unit. Lamphus includes an optional jumper wire that you can connect to your vehicle's horn circuit so that pressing your vehicle's horn button engages the Lamphus Horn, which can be quite loud. It's a bit of an electric air horn sound, like some of the Police cruisers use. When the control box is turned off, the Horn feature will not work, and when the unit is turned on, the volume knob controls the volume of the Horn, whether using the jumpers or pressing the momentary manual switch on the unit.

SIREN
I disabled the siren functions because I don't want or need them. I did try it all out during bench testing of course and found the sirens to be toyish. The tones go too high and for too long - they just don't sound like any emergency vehicle sirens. Fine with me - I didn't want them.
I disconnected the brown wire behind the momentary on/off/momentary on switch so that now only the Horn function works and not the momentary Siren. Also, I put a screw directly into the face of the device next to the Mode selection knob in such a way that only the Radio and Standby modes can be selected.

PA
The PA works brilliantly. The volume control which also turns the unit on, controls the volume of the PA as well as the volume of the horn and siren. The microphone unfortunately is permanently attached to the device not allowing for easy replacement or disconnecting for any reason. But the handheld mic seems sturdy, the switch works fine, and the microphone seems to pick up well. There is a very brief delay once the PTT button is pressed until it transmits.

RADIO Mode
There are two white wires which can be used optionally. They can be hooked up to any device's audio output such as a CB radio, Ham/amateur radio, or iPod, etc and broadcast over the loudspeaker. The volume is controlled solely by the external device (ie: CB, Ham, iPod), and not by the Lamphus' system volume. When Radio mode is selected, any signal input into the white wires will be broadcast at the device's volume level regardless of Lamphus volume level. The Horn and Siren switch can be used and the PA can be used during operation in this mode and it will momentarily cancel the input signal.

CONTROL 1 and 2
These are two basic switches. You can run a light bar or any other 12 volt device using the supplied wires running from the main harness.

LOUDSPEAKER
The speaker seems very sturdy and the low profile allows for many mounting locations. I mounted mine between the grill and radiator so that it faces forward but is hard to see from the front of the vehicle. A typical cone shaped speaker would have had to be mounted in the engine compartment or somewhere under the front bumper.

The media could not be loaded. WIRE POWER TO FUSE OR YOU WILL HAVE A DEAD BATTERY. PIGGY BACK A FUSE THAT TURNS OFF WHEN THE TRUCK IS OFF. PA is very clear and sirens are fun. Bought for the horn and PA bc the sirens can get u in some trouble 😂. But took about 3 hours to install only because I had some problems feeding the wire. Very good system.