Sound activation, magnetic lid and automatic turn off after 30 minutes.
Shell not vey solid screw wise.
This is a good buy if you need somthing to keep up with your electronic gun. This is somthing you would buy for a electronic spyder or tippman. This is the hopper for a novice player this even a great gift for anyone with a decent gun. If you buy this remember to keep some extra batterys it uses two at a time.