I really like the clean simplicity of the design for this Mini Koo Non-Electric Speaker. Essentially it’s just a wooden amplifier but a beautifully crafted one at that. It’s made from walnut and fits all iPhone sizes to increase the volume of your music without cords or electricity. Very elegant.
Speck Products CandyShell Amped Sound Amplification Case for Samsung Galaxy S5 - Raspberry Pink/Shocking Pink
Bobj Rugged Case for ASUS MeMO Pad 7 ME572C, K007 Model Tablet - BobjGear Custom Fit - Patented Venting - Sound Amplification - BobjBounces Kid Friendly (Bold Black)