40 Channel, Ultra Compact, CB Radio with Mic Display and Controls is perfect for off road use and designed to provide years of trouble free service. It easily installs and at just 4 x 4 x 1 inches, is easy to mount on top or underneath your dashboard or even under the drivers seat in a vehicle. This CB is great to use in Jeeps, trucks, cars or anywhere space is limited or a small CB is desired. If using in a noisy environment like an open air Jeep or diesel truck, an external speaker is recommended.