The Plantronics Vista M22 Universal Audio Processor Headset Amplifier could be the perfect solution for your communication needs. This black device allows you to control the volume, making it easy to hear what your caller is saying. The proprietary connectivity ensures a secure and easy connection to your phone. This model is widely available and the brand Plantronics is well known for quality products. The model M22 is a headset amplifier that can help you improve your communication experience.