The K-Array Ecodock Eco-Amplifier for iPhone 4 / 4S is a wireless amp that requires no batteries or power source. It relies on the natural laws of physics to boost your iPhone's speaker output by up to 10dB. It's loud enough to enjoy music with friends. It also works well as a hands-free docking and voice calling station for your iPhone 4 or 4S. The Ecodock lets you increase the volume with increasing power use. This means you'll be saving your iPhone's battery life as well.
Wireless with no batteries or power supply needed
Uses natural laws of physics to amplify your iPhone 4 / 4S
Adds an extra 10dB for voice calls and music
Clearer sound for listening to music with your friends
Increase your volume without increasing power use
Save your iPhone's battery life