This universal wooden dock's unique design boosts your smartphone's speaker to emit room-filling sounds without wires or a power source. No Bluetooth and no batteries needed: Just place any smartphone into the acoustic speaker's slot and play your favorite music. Known for superb sound-conducting qualities, its birchwood design allows for higher volume and a wider frequency range. Engineered with seven layers of precisely cut wooden rings to capture vibrations from your phone and amplify the sound. A double-coated flaxseed and beeswax finish protects the sound system against all of nature's elements.