Mega AMP a wooden cell phone amplifier. Works without electricity. – Vermont Wooden Toy
Amazon.com: Mate2GO Phone Stand Sound Amplifier, Wood Phone Stand for Desk, Desktop Phone Stand, Phone Speaker Amplifer Holder, Handmade Wooden Phone Dock Compatible with Smartphone, Kindle, Mini Pad - Beech : Cell
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How to Build Cell Phone Speaker Amplifier : 10 Steps - Instructables