Features of the UA-50:

• 45dB amplification, ideal level for those who constantly ask the speaker to repeat themselves
• Tone control defines and enhances sound quality
• Can be used with any headset with an RJ9 plug
• Works with virtually all business telephones
• Digital Sound Processing technology eliminates virtually all distortion, echo effects and unwanted static
• Automatic Gain Control optimizes the sound level for superior listening comfort
• AC adapter included (9V battery optional)

Features of the EncorePro 540:

• Wideband audio delivers richer, clearer conversations
• SoundGuard technology protects hearing and listening fatigue
• Three easily swappable wearing styles-over the ear, behind the neck and over the head
• Right or left side wear
• Microphone reduces background noise and interference
• Swivel and bendable microphone boom
• Adjustable headband
• Clothing cable clip
• Quick disconnect cord will put call on hold when unplugged
• Helps comply with OSHA/Noise at Work regulations