Hisense 55" 4K UHD Digital Signage Display (HISENSE 55BM66AE) - Resolution: 3840 x 2160, Contrast(typ): 1100:1 (typ), Brightness: 500 nits (typ), Refresh rate: 60HZ, Built in speaker: 8W x 2, Connectivity: WIFI: 2.4G/5G, LAN: 10/100Mbps, Operating System: OS: Android 7.0, VESA: 300*300mm