goblinIT< - - - - Pretty much what he said.
I ordered the cradle (with the 2nd battery slot) from Mugen Battery dba Etrade Asia Limited, Wanchai, Hong Kong.
It's study and weighty. It does NOT say "Kidigi" on the front. It does cradle the phone nicely. I'm satisfied with all that.
The two lights are indeed blue and green. The blue light stays on to indicate the charger is DRAWING power (from the micro-USB plug in the back being connected to a wire that is, in turn, plugged into either a USB port or an AC wall plug). That left blue LED is debossed just below to show it's a "power" indicator. The other one is debossed just below to show it's a "battery" indicator. It's normal mode is green "for go," it's ready to accept a second battery in the back saddle for charging. According to the instructions I got, the green LCD will switch to red when a battery inserted into the back saddle is actually in the process of being charged. And that the LED will turn to blue when the battery in the back saddle IS fully charged. Since I am not actually charging a second battery in that back saddle, my lights stay blue and green no matter what, just like goblinIT said.
And like he said, you can't get to the audio plug. The actual plug is exposed but there's no room around it. They should have had a semi-circle cutout there so you could get a plug in and out.
When comes to the USB wires that came with it, well it's a durn puzzle. There's just one female micro-USB plug in the back, yet the gizmo shipped with TWO micro-USB-to-regular-USB wires. One was marked "data only" and the other was marked "power only." WTF? I am supposed to switch these wires back and forth all the time depending on whether I am charging or transferring data? I am sitting here wondering if these two wires are actually not fully pinned, that one has only power pins, the other has only data pins. And NEITHER of these wires is long enough to be usable anyway, about 3 feet, from the base of my PC up to the top of my desk without a single inch of slack. I ended up using another, longer USB wire to connect the charger to the back of the computer. Then I threw the OEM two wires that came with the cradle – and with the uncertain pinning - into the kitchen trash can. The unit does charge AND transfer data simultaneously without problem via the single USB wire (that I provided.)
Then I also rec'd an American-AC-wall-plug-to-regular-USB converter. Like the one in the goblinIT picture except the wings are flat and would fit into a regular American wall socket. (Instead of the plug that goblinIT got that is for Euro wall usage.) I won't need it so I'll just toss in my pile of other charger gizmos where it's far more likely to come in more handy. Why didn't they put a second female plug-in of some kind into the back of the cradle … so I could send additional charging power to the cradle with this AC plug. Oh, well.
Looking back I wish I had ordered the version without the back battery saddle from the 4uMobi link provided above. I'll never use the back battery saddle. Besides, if I didn't have it, the green light might have been doing something more useful!
Happy Motoring !