1. 24 hours timer (For 4501L-Erp);7.5hours timer(For 4501/4501L)
2. Weekly timer (For 4501L-Erp)
3. 2 heating powers:1000W/2000W
4. Window open function (For 4501L-Erp)
5. Delay open and closed function (For 4501L-Erp)
6. Safety PTC ceramic heating element
7. Fan/warm/hot wind for selection
8. Remote control
9. Wall mounted sets included
10. Overheating Protection
11. With LED display (For 4501L/4501L-Erp)
12. Passed ERP (For 4501L-Erp)