For all the benefits of touchscreen keyboards, there are many who maintain a steadfast allegiance to the gods of tactile feedback. So how does this Mini Key case with sliding QWERTY for the iPhone 4 strike you? Unfortunately, the keys were a bit hard to press on the backlit prototype keypad handled by Engadget Spanish, and it links to the iPhone via Bluetooth, not the iPhone's dock connector (there's a cutout at the bottom for a cable to pass through). And no, all that added bulk still doesn't include an extended life battery pack. Perhaps some of this will change before it goes on sale before the end of the year for $60 / €60, we doubt it though.
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Nuu Mini Key adds a bulky physical keyboard to the iPhone 4

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