Which medical alert companies do you use?

My son is a wheelchair user who mostly uses one hand. He is in a residential Independent Living skills program; this year in the dorm, next year in off-campus housing. I'd like to get him something he can wear even in bed or in the shower, to summon help if something unexpected happens. I understand that Life Alert is expensive and maybe not even the best. Does this community have recommendations?

Edit to add: My son does not have a seizure disorder - it's just spasticity and general clumsiness with transfers that worry me. He does have good use of one hand, and partial use of the other; he would be able to press a button with either. I can imagine him getting stuck between the bed and the wall, and being unable to climb out, or falling and getting injured in the bathroom. I wouldn't want him to be alone for hours, waiting for an RA to come looking for him. I suppose, ideally, it would alert whoever is close - school staff, or us, depending upon where he is when he needs it. (We live hours from the school.) If that's hard or too expensive, alerting a dispatcher for local emergency services would be better than nothing.