Mack’S Audibles® Personal Sound Amplifier Product (Psap) Aids Those Who May Need An Occasional Volume “Boost” To Hear Speech More Clearly. This Digital Hearing Amplifier Helps Enhance Your Life By Amplifying The Sounds You Want To Hear Two Sound Enhancement Modes For Optimal Sound In Any Environment. Includes Multiple Ear Tip Sizes, For A Comfortable, Secure Fit In Any Ear Advanced Technology Combines The Best Aspects Of Digital And Analog Technology To Supply Clear, Crisp Audio And Sound Enhancement. Clean, Simple, Fashionable Design. Raised, Easy-To-Locate, Easy-To-Use, Soft Touch Controls. Includes Storage Case Unique Battery Door Allows For Quick/Easy Battery Replacement. Swivel Ear Piece/Amplifier Makes For Convenient Use In Either Ear With The Incorporated On-Off Button Design, There’S No Need To Remove Batteries When Not In Use. Requires One Size 13 (1.45 Volt Zinc) Battery (Not Included). Comes With A 1-Year Warranty And Lifetime Technical Assistance