You 't need care about . As long as your old remote control is similar to this item, it can work with your AC. Many use the same remote control like Carrier//FRIMEC/ /ECOXTOSHIBA. It works with all R57 series and all RG57 series remote controls like: R57B1/BGE RG52A2/BGEFU1 RG57/BGE RG57A/BGE RG57A1(B)/BGE RG57A1(B)/BGEF RG57A1/BGEF RG57A1B/BGEF RG57A2/BGEF RG57A3/BGEF RG57A4/BGEF RG57A6/BGEF RG57A6/BGEFU1 RG57A7(B)/BGEF RG57A7/BGEF RG57B(B)/BGE RG57B/BGE RG57B/BGEFU1 RG57B/BGE-OS RG57B/BGEU1 RG57B1/BGE RG57B2/BGE RG57BB/BGE RG57D/BGE RG57D1(C)/BGEF RG57E1/BGEU1 ... Maybe this remote control looks different from your old remote control, this one is an updated one can work with your AC. Use:Air Conditioner Wireless Communication:IR Frequency:433 MHz Channel:1 Model Number:RG57A4/BGEF color:White Material:plastic Package Contents: 1 x Universal AC Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.