1) Quiet operation with low noise level for cassette type air conditioner. 2) With auto defrosting system, powerful heating even at low ambient temperature -15 Centigrade . 3) Capacity Range: 18000btu - 48000btu for cassette type air conditioner . 4) With CE approval for cassette type air conditioner . 5)With RoHs Compliance for cassette type air conditioner /air condition.