Lithium Battery Voltage 1.5 Volts About This Item NEVER MISS TO HEAR AGAIN! INTRODUCING A NEW KIND OF DIGITAL SOUND AMPLIFIER: Featuring our latest smart digital chip technology, including active digital noise reduction, you'll hear conversations clearly so you can easily understand everything that's being said and enjoy life again. CRITICAL! RECHARGEABLE BATTERY LASTS ALL DAY ON A SINGLE CHARGE: Our digital hearing amplifier is rechargeable, which means you won't have to constantly change batteries in the middle of a conversation or run out of batteries again! That's why, through extensive research, we've created the longest battery life hearing amplifier in the industry. DESIGNED AND RECOMMENDED: Finally a hearing amplifier to make your life easier. With our easy to use digital frequency control. Change the volume easily with just one touch. Featuring six modes for precision amplification.