Hydrow must be plugged in and powered on to enable its electromagnetic resistance mechanism. Without power, Hydrow will not provide dynamic resistance.
Hydrow's resistance mechanism does not require an internet connection, but all workouts and screens (including the basic features of Just Row mode), DO require an internet connection.
We very strongly recommend using Hydrow where a strong internet connection (WiFi or Ethernet) is available.
See also: Hardware & Electrical Specifications