Smart Hub SPEC: 2.4 GHz, 868 MHz, 1 × Ethernet Port FEATURE: 90dB Adjustable Audio Alarm, 19 Ringtones, Up to 64 Switches, Sensors or Buttons + 4 Cameras or Doorbells, Mute Button, Easy Setup, Device Sharing, Flame-Retardant, Local Storage through microSD Card (Up to 512 GB), Tapo App