Digi-Cabi Dry Box with Digital Hygrometer DB-012 (12L) Dimensions: 270 x 230 x 195mm DB-022 (22L) Dimensions: 330 x 280 x 235mm Digital Hygrometer uses LR44 cell battery Hygrometer displays %RH and temperature Dry box must use with silica gel packs or rechargeable dehumidifier (optional purchase) Suitable humidity for storage is between 25-55% RH, depending on the items you put in