Midland 5001Z 40-Channel Mobile CB with Switchable Noise Filter 5001 CB Radio. 40-Channels. 4-Watt Output Power-Delivers maximum communication range. Xtra Talk Mic Gain-Boosts transmit audio sensitivity to give you increased voice clarity. RF Gain Control-Adjusts reception sensitivity (range) for clear reception. 40 Channel CB with 4 Watt Output X-Tra Talk Mic Gain Control PA function, Dimmer Switch, Analog Power Meter, and Automatic Noise Limiter. Instant Channel 9 Full Size Microphone with locking connector