Review on YHAAVALE 9200E Amplifier Emergency Police Siren & Ultra Slim Metal Octagon Compact Flat Speaker, DC12V 100W Multi-Tones Wired Control with Mic Loudspeaker Electronic PA System for Police Vehicles by David Cook

The intercom sucks. Sounds like a bad cell phone connection. Get in and out. Still, I like it and will definitely buy it again. It was an easy install, but please make sure you have a suitable space in your car to mount this unit before purchasing. It should not have any obstacles outside. You can also do some prep work and try to find a 1/2 inch hole that goes through the firewall. There are 2 green wires going from the amp to the speaker + 2 wires, red and black, going from the amp to the battery. The controller or handheld plugs directly into the amp, so you'll have to bring it into the car as it's not wireless.