iFixit Precision Electric Screwdriver
/I’ve been after a small handheld electric screwdriver for a while. I ended up getting this one from iFixit. It works very well. It has three leds that illuminate what you are working on. It is powered by a couple of AAA batteries and has enough torque for most tightening duties.
It’s one of those things that, once you’ve got one, you wonder how you managed without it. One thing you do need to remember is that it doesn’t come with any screwdriver bits. If you have already got some 4mm bits you’ll be fine though.