Confirmed available models: 500C, 500CM 501C, 501CM 503CX, 503CXi, 503CW 1000F 2000 FCM SWC, SWC/M, 903SWC PME5, PME51 Finder Confirmed NOT available models: 200 series 500ELM, 553ELX Flexbody NC2 Prism Finder Other models are not confirmed. We cannot guarantee the availability. Function Film ejection by electric motor controlled by MCU Film counter Battery status display Specifications Mechanical dimension: 129 x 111 x 50 mm (width x height x depth) Weight: 330 g Power supply: 2040 mAh Li-ion battery. Input: DC 5V, 1A Film: Fujifilm instax square film, ISO 800 Film size: 72 x 86 mm (width x height) Picture size: 62 x 62 mm (width x height) Package: NONS Instant Back, USB Type-A to Type-C cable, Stainless Steel Dark Slide (The dark slide can only reduce light leak temporarily. When you want to remove the instant back with unexposed film inside from the camera body, firstly insert dark slide, take off the instant back and put it in a light tight cloth bag or box at once)