Class? Yes! - This is my favorite!! I've been with my new class for 4 days, and they were experts in this by the end of the first day... Here's a link to a post with my favorite Whole Brain Teaching video - it will change the way you teach. :) Yes, for the better!!
Music Wand - it's awesome! Here's the one I got... <3 it!! (No, they didn't pay me for this! I just like it!)

If You Can Hear My Voice... - Love it! Here are a few of the ones I use...
- If you can hear my voice, clap once. If you can hear my voice, clap twice. (repeat until everyone is "with the program."
- If you can hear my voice, hands on hips. If you can hear my voice, hands on head. (etc.)
Windchimes - The only standby... my chimes were left by the previous teacher. They are super cute ceramic fish (very beachy!) and they make a lovely sound. I have them hanging under the flag where we can all reach them, but not by accident. I do occasionally send students over to ring the chimes for me, which always gets the attention of the other kiddos.
What do you do to get your class' attention?