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Amazon.com: Personal Sound Amplifiers - (2 Pack) Personal Audio Amplifier Device and Voice Enhancer Device for Sound Gain of 50dB, Up to 100 Feet Away, Pocket Hearing Devices : Health & Household
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Amazon.com: Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono 800 Watt Subwoofer Amplifier - 1 Ohm Stable - Includes Bass Remote : Electronics
