Source Unit Tuner Section FM Stereo Frequency Range — 87.5MHz-108MHz. Source Unit Tuner Section S/N Ratio — > 55dB. Source Unit Bluetooth Range (ft) — 32. Source Unit RMS Power Output (watts) — 4 x 20. Source Unit Peak Power Output (watts) — 4 x 40. Source Unit Pre-amp Outputs (Y/N #) — 1 Pair. Source Unit Pre-amp Voltage — 4.0V. Source Unit Minimum Impedance (ohms) — 4. Source Unit Display Type — LCD. Meets or exceeds IPX5 requirements for water and dust proofing. LIFE SHIELD: This product has been designed and tested against the elements. Waterproof, dustproof, snowproof or shockproof. Built to handle the outdoors. Quick control and access of iTunes collection with iPhone, iPod and iPad. Bluetooth, RCA, USB: Nearly nothing the device can not play. Front facing buttons to engage and adjust all features. Quick and secure wireless connection between your Bluetooth enabled device. This reliable connection is impervious to outside interference, providing a lock-tight connection to your audio system. No more frustration with trying to pair. When the unit powers up, it immediately connects to the last device connected. For a first time connection, you only have to select “MB Quart” from your Bluetooth menu and you are connected, QUICKLY. Four channels of output. These channels remain active when running external amplifiers (RCA Output) to run additional speakers in the vehicle. 9 control buttons on faceplate. Car Toys is an Authorized Retailer of all products we sell online. All’New’ products are brand new in unopened retail packaging. We’re a real American national retail chain based in Seattle, with 48 stores all around the West. To see our feedback. We do not mark merchandise values below value or mark items as gifts. US and International government regulations prohibit such behavior. Your satisfaction is very important to us. QUESTIONS ABOUT PRODUCTS, ACCESSORIES, OR INSTALLATION?