The core M&M book supports multiple devices of the same type (easy-to-lose or hard-to-lose) being bought under a single Device container. One of the MeMa characters I'm inputting uses such a construction, with a wrist-mounted unit that costs 12 pp and a set of high-tech sunglasses which cost 3 pp. Right now, I'm putting them in as one device, but it would be nice to have them as separate devices so that they could be added or removed separately and/or temporarily handed off to others.