Ultra-compact, perfect for a long day road trip. No license required, easy to operate Equipped with a 29-level squelch system and upgraded sensitivity chip, this radio allows clear reception during communication and the ability to set signal strength parameters for station selection. With the included microphone, the mic cord can be extended up to 78 inches for easy access. You can quickly jump to the emergency channel 9 and trucker channel 19 by pressing the EMG button to switch channels instantly. The CB-27 PRO has a built-in speaker, but also works with an extra loudspeaker to amplify the audio. Features - AM/FM Station - VOX - Instant Channel 9/19 - Squelch Control - RF Gain Control - Keyboard Lock - Channel Scanning - Car Charger Power Supply 　 VOX Function Press and hold the PTT button, then short press the “EMG” key to activate the VOX function.