Qwik Time QT-3 Quartz Metronome  

This is a great metronome, nice and simple. Give you the beat and thats all you need. Volume control would be nice for drummers sake, but I guess you can use the line out for some computer speakers and get it a little louder... I wouldn't recommend it for drummers. For guitar, piano, etc. its great, everyone I know uses it - short and sweet.

The earphone jack only plays through the left ear on mine. As others have said, lack of volume control. Wish I woulda shelled out a little more money for something slightly better. It's not really loud enough to use with drums either.

I teach guitar and bass and do 2 shows daily, plus play in 2 or 3 bands after the shows. I like this metronome for the ability to find any tempo, and the sound of the click. It's very hard to use for locking in with a tune to find the tempo, so I use my sequencer for that. But just for basic use, I like it and recommend it to my students. I've had it for years and have beaten the literal crap out of it, but it stills works great and still has the first battery I ever put in it. 

The metronome will keeping incrementing up in beats per minute all by itself.  Absolutely frustrating to have a metronome that cant keep time.  You're practicing and all of the sudden the device skips a beats and you look up to see that it is now on a faster rate.  You rolls your eyes and adjust to the new tempo and a minute later is does it again. (makes you want to pull a "The Who" maneuver by swinging and smashing the little thing with your guitar.  Spend an extra $5 to $10 dollars if you are looking for an entry level metronome, because you may end up buying another one anyway.

I do not recommend this metronome, it is hardly useful it doesn't have any rhythms and the click is hard to hear when your playing without silence pads. I recommend to go with a higher price metronome that plays 8th notes, 16th notes, triplets and all the good stuff.