JWIN i399 Hi Fi Audio System for iPod with BluePin JWIN i399 Hi Fi Audio System for iPod with BluePin ii. It is 2.1 channel iPod docking audio system with built in woofer. It comes with a detachable BluePin. BluePin is a combination of Bluetooth TX and Bluetooth RX, whereby a user can connect BluePin to his or her BT mobile phone or BT headset. With this BluePin, the unit can turn into a speakerphone easily or transmit audio wirelessly to a BT headset. It also has a built in digital synthesized FM radio tuner with ability to preset 20 radio stations. It uses a negative LCD with white backlight for display. It also supports AUX input to play and listen to other audio devices with 3.5mm output jack.