EXP43 expansion module (sidecar / attendant console), 60 keys (3 pages of 20 keys) with LEDs, 4.3 inch colour backlit LCD (the expansion module background colour will match the background colour of the telephone), for T43U / T46U / T48U. Note: If you use two or more SKU #EXP43 expansion modules on a single telephone, you will need to purchase (sold separately) a power supply, SKU #PS5V1200US, and connect it to the first expansion module.