hello, the model ch250 has the motor underneath and is fixed firmly and securely to the work surface by means of four suction cups on the housing. on the model ch580, on the other hand, you hold the motor in your hand while working/chopping.

Yes, it has an adapter.

Onions can also be cut with it, but if only one onion is inserted, pieces of 3-4 mm remain. The machine has a Swiss mains plug. Greetings Paolo

Currently 4 pieces are in stock at the supplier and the delivery time is approx. 2 weeks (without guarantee).