Universal Cell Phone CradleOur DM547 Universal Cell Cradle with built-in antenna makes amplifying your cell signal simple. The adjustable cradle holds any size cell phone, including PDA phones and the iPhone 3G. The built-in antenna inductively couples to your cell phone's antenna. When used with Digital Antenna's DA4000MR 3W 40dB gain dual band repeater or DA4000 3W direct connect amplifier (both sold separately), you will experience up to 10 times the signal strength.Use with Bluetooth products, hands-free kits, earbuds or a speaker phone to allow amplification of the cell phone signal while the driver is hands-free. Includes a 3M adhesive back mounting bracket with a screw mount option.Features:Compatible with all cell phonesBuilt-in antennaFlexible and easy to useIncludes mounting hardwareQuick release buttonAdjustable holding feetDM547 Universal Cell Phone CradleFrequency: 800-2500 MHzConnector: Mini-UHF maleCable: Includes 10' of premium RG174 cableImpedance: 50 ohmInsertion Loss: 2dB