40 Channels.RF Gain adjusts reception sensitivity range for clear communication.4 Watts of power the maximum allowed.Locking Screw in Microphone.Channel 9 Switch The compact Midland CB-1 40-channel CB Radio is the replacement for Midland’s popular 1001Z. The CB-1 packs 4 watts of power with an independent RF gain control and squelch for crystal clear reception. A pro-quality microphone with screw in connector locks securely to the CB. The PA feature turns the CB into a public address system when an optional speaker is connected. The easy-to-read digital display means you'll never need to take your eyes off the road any more than absolutely necessary. The Ch. 9 switch gives instant access to the emergency channel. Installation is a breeze in most cars, trucks and RVs. Perfect for novices and long-time CB users alike. Great for trucks, cars, boats. The CB-1 features a 3 Year Limited Warranty and includes a mounting bracket and hardware.