THE JBL ON CALL 5310 phone loudspeaker dock is the latest groundbreaker in an impressive line of JBL ® innovations. A compact, portable, high-performance sound system, it's designed specifically for the Nokia5310 XpressMusic phone. The JBL On Call 5310 system benefits from that commitment, incorporating unique technologies that make it the ultimate in great-sounding portable audio. When connected to the Nokia 5310 XpressMusic phone or any other music source with an audio jack, the JBL On Call 5310 system will provide lean, powerful sound that's guaranteed to impress you and anyone else who's listening. And the integrated connector on the system charges the Nokia 5310 XpressMusic phone. Just one more reason the JBL On Call 5310 system is an ideal partner for the Nokia 5310. ADVANCED TECHNOLOGY The JBL On Call 5310 system combines many proprietary technologies to provide the highest quality sound. It provides astonishing bass and clear, accurate sound from any direction. And its two Odyssey ® full-range transducers are driven by powerful neodymium magnets, while its Odyssey tweeters provide accurate high frequencies. COE (Computer-Optimized Equalization) ‚¬â€œ The JBL On Call 5310 system equalization is computer-optimized to provide a rich, complete soundstage. OCT (Optimized Compression Topology) ‚¬â€œ The JBL On Call 5310 proprietary compression technology ensures clean, accurate sound at high output levels. The JBL On Call 5310 speaker dock is compatible with the Nokia 5310 XpressMusic phone. The included charge port charges the Nokia 5310 XpressMusic phone whether the JBL On Call 5310 is powered on or off. There's also a quick-release feature on the JBL On Call 5310 that allows for easy access to the music phone. And with the additional stereo mini jack connection, you can enjoy high-quality audio from a variety of devices, including all Apple ® iPod and Microsoft ® Zune models, MP3 and CD players, desktop computers etc.