If you’ve got a USB power source, you can keep your fingers warm. Good for typing, smartphone use, and of particular indication for those with poor circulation in the extremities - for whatever or whenever one can imagine needing warm, non-numbed-by-cold fingers.
Japan’s been using those little mini-dynamo generators to power bike lights for decades, and that doesn’t require a whole lot of power. Charging a smartphone or GPS guide thingy is a different matter, but it seems that Thanko has found the answer.
Elecom is going to release a USB3.0 memory stick with conversion adapter between microUSB and USB - the MF-SAU3 series - in late April. Because of the built-in conversion, the MF-SAU3 series can connect both smartphone (USB2.0) and PC.
This small USB memory stick separates into 3 parts: a USB memory stick, a conversion adapter for smartphone/tablet, and a cap for the adapter.
8GB model - MF-SAU308GBK 16GB model - MF-SAU316GBK 32GB model - MF-SAU332GBK
With Thanko's new 8W USB soldering pen, if there is a USB port around you, you can solder anytime. When you bring a mobile battery with you, seriously you can get your soldering work done anywhere, anytime.
You are ready to use it after connecting the USB soldering pen and USB port with the accompanying 140cm cable. It can get hot in 15 seconds and can cool down in 30 seconds, so you need little time for preparation and clearance.