The hand-crafted natural rubber wood acoustic speaker for your iPhone or Android mobile device with a beautiful modern look. Boosts your tunes an additional 15dB+, naturally, allowing you to charge at the same time. Compatible | The wooden phone holder works well for almost all cell phones and tablets no thicker than 10mm (measured with case on), handcrafted from Natural Wood made from Grade Rubber Wood and finished to be silky smooth. *Just make sure your device is no thicker than 11mm/.43" thick and 88mm/3.5" wide base to fit cradle. Natural Amplification | With a carved special chamber, the wooden phone amplifier will boost the sound level by 8-10 dB with no need for an actual electronic speaker. The amplifier function suits devices with its speaker located near the bottom.