Philips SBA1710 Portable Smartphone Speaker Cradle with 3.5mm Auxiliary Cable Green Portable speaker for 3.5mm portable devices class "D" digital amplifier for superb sound quality 4W RMS total output power delivers Premium sound that can be heard throughout the room up to 8 hours music playback off of two "AA" batteries Built-in 3.5mm auxiliary cable provides Universal playback of iPod, MP3 players, and smartphone devices