Brand: XINGMA Model: XM-909E Power supply: 2 x LR44 button batteries Dimensions: 90mm x 70mm x 30mm Weight: 139g Behind-the-ear design Allow you to capture and amplify sounds you can hardly hear with your own ears Can also help people with hearing impairment to hear sound and voice Volume adjustable Silicone earplugs in 3 different sizes, fit for most ears Warranty: 1 Year XINGMA XM-909E Mini Voice Amplifier Hearing Aid Behind the EarDo not be fooled by the small size or appearance of this device. It may look like a simple device designed to hide right behind your ear, but is actually a major breakthrough in sound interception and amplification technology. State of the art electronic engineering actually allows you to capture and amplify sounds you can hardly hear with your own ears. Slip on this technologically advanced device and you will instantly hear like a super hero.