Bose wave system controller- needs battery and tray-but good replacement.

3.25” x 2.25” size. For the wave music system. You need the slide in tray and the battery- but if you’ve got a control that broke, you can use the one from that. See second photo- that’s where it slides in. Worth a shot- most Bose HAVE to have the controller bc there are no buttons to work it ON the unit itself.