Sound Activation Tilt Sensing - the agitator always pulls the balls up towards the feed hole. If you tilt it the right it spins counter-clockwise. If you tilt to the left it spins clockwise. Low frontal profile with 210+ ball capacity
The Odyssey HALO TSA LCD Backman is newer, so it should be commonly available, both new and used.
I got this hopper cause it could keep up with my full auto and held way more balls than other hoppers. Right out of the box it didnt agitate unless it heard extremely loud sounds. Since its sound activated I turned the sensitivity to the lowest setting and it still barely agitated. I sent it back the next day because I need a hopper thats going to actually agitate when my gun makes sound, and i dont have a particularly quiet gun either. Maybe sound activation was a bad idea here.
Dont bother with this one. Get a ricochet, they are sensor activated and my Ricochets have never failed me.