The sound amplification system is affordable. Lightweight and compact you won't even feel like you're wearing it. Whether you're in the theater watching TV listening to soft music or just having a quiet conversation you will hear loud and clear. For your convenience comes with 2 batteries say goodbye to the frustration and embarrassment that comes with not being able to hear properly. - 4 levels of volume control - Comes with 3 differently sized ear pads - Powered by 1 x AG13 battery (included 2 pack) - Maximum loudness 130 +/- 5dB - Sensitivity: >= 50dB - Frequency response: 300Hz ~ 4000Hz - Comes in retail packaging