According to Clarke's Third Law: "Any sufficiently advanced technology is indistinguishable from magic." AirCurve Play is based on some very advanced technology, indeed and when you hear it, you will agree it is magical. AirCurve Play makes the speaker of your iPhone 10 decibels louder no, really. And it works without batteries or cables or power adapters or incantations. Just slip your iPhone into AirCurve's rubber dock gasket, and your iPhone 4 becomes the perfectly portable audio/video conference phone, and self-contained music player and video viewer. Manufacturer: Griffin Technology Manufacturer Part Number: GC10038 Manufacturer Website Address: Brand Name: Griffin Product Line: AirCurve Play Product Model: GC10038 Product Name: AirCurve Play Smartphone Holder with Acoustic Amplifier Product Type: SmartPhone Holder Placement: Desktop Compatibility: Apple Smartphones: iPhone 4 (16GB, 32GB) Type: Case & Covers Compatible Phone Manufacturer: Apple iPhone 4 / Apple iPhone 4S