Electronics help

[tres]

What would you call these little tiny thingys on this PCB?
As you can see (or not, apologies for the potato photo), one has fallen off, and I'm guessing this is the reason my thermostat remote is no longer working.

Is it possible to buy these using the only information on the tiny things - "106"? If so, I might have a go at soldering one on...

Thanks!

Big image:

Spoiler

 

[tres]

Thank you chaps, much appreciated! I will attempt soldering for the first time. Worth the try considering these old units are about 50 quid anyway