Does it have an off position on the switch to keep it from accidentally going off in your pocket?

Yes. Where the 3-2-1 whistle levels push it all the way & it will be in the off position.

Is there a trick to getting the battery cover off? I pushed the switch down but I can't get it off. I don't want to force it and break it.

I push switch down and use my finger nail at the same time and pull it open. Not the best design but that works for me.

Is there a volume control? Is that what the “3 tones” means... I want to use this in a 500 sq ft classroom. Not sure if it will be too loud.

The three tones means there are three different whistle sounds. It does not have a volume control. We use it outside to referee soccer. I have "tested" it in my house, and it's pretty loud. However, I have small rooms, also. If you use it in a short burst as opposed to a prolonged tone, you would probably be ok. However, it really depends on how loud you need it to be to be heard.

Brand	Fox 40
Color	Red
Item dimensions L x W x H	8.5 x 5.3 x 1.4 inches
Style	Modern
Noise Level	100 Decibels
EU Spare Part Availability Duration	1 Years
Automotive Fit Type	Universal Fit
Manufacturer	Fox
UPC	772259136518 796793335985 066143550000 720389033504
Global Trade Identification Number	00066143550000
Item Package Dimensions L x W x H	8.98 x 4.45 x 1.61 inches
Package Weight	0.11 Kilograms
Item Dimensions LxWxH	8.5 x 5.3 x 1.4 inches
Item Weight	100 Grams
Brand Name	Fox 40
Model Name	Electronic (3 Tone) Fox 40 Whistles
Suggested Users	unisex-adult
Number of Items	1
Part Number	8616-1908
Included Components	1 x ELECTRONIC (3 TONE) FOX 40 WHISTLES
Size	us:one size
Sport Type	Soccer

Electronic Whistle -DS

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