The Power Trolley can house either 3 tiers of shallow trays, charging 30 devices at any one time or 2 tiers of extra deep trays, charging 20 units. (qaeducation.co.uk)
Choose one with a nice deep tray that not only allows a thick layer of bedding but also will help to reduce the amount of bedding your hamster will push or kick out of the cage. (thesprucepets.com)
When it comes to functionality, it has a peekaboo window, parent and child cup holders, deep tray for child, a covered parent storage area, ample baggage area, multiple recline positions and a lockable front swivel wheel for extra maneuverability. (checkpregnancy.com)