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For iPhone 4 Battery & FM Transmitter & Handsfree Car Kit

*The portable 3 in 1 power magic gives you full access to charge for iphone 4 & iPhone 3GS & iPod.
*Meantime it support charging other mobiles and digital devices via USB output port.
*wireless FM transmitter ability lets you share the music from your iphone & iPod on your car's FM radio.
*It also keep charging when you share your favorite music playing for the longest road trip. 
*For FM transmitter function, It's simple to use, just to plug the 30 pin connector into iphone or iPod. For other music player or mobile phone, you can use the standard 3.5mm earphone jack for connecting.
*With High quality Circuit Protection Module

Specifications:

Battery

Input: 5pin Mini USB 5V-0.5A
Output: 30pin standard iphone interface and USB interface 5V-1.0A
Capacity: 1300mAh Li-Pol A grade battery
Compatibility: Work with iPhone 2G, 3G, 3Gs, 4G, iPod, Mobile phone and other digital products.  Standby: 200 hours

FM Transmitter

Interface: 3.5mm audio interface for mobile phones and 30pin connector for iPhone & iPod
Frequency: 76~108MHz , adjust frequency by press button + and - by 0.1MHz

Hands free speaker

Frequency response: 20Hz-20 KHz
Working range: 3-9 meters
Sensitivity: ≥50dB
Working electric current: 50mA
Standby electric current: 90μA
Power: built-in battery
Audio input: 3.5mm stereo earphone jacket
Working electric current: 50mA
Microphone sensitivity: -42 ± 3 d