The new version Shelly Bypass R2, released in September 2022, is an accessory from Shelly that works together with the Shelly 1L Single Wire WiFi Smart Relay and the Shelly Dimmer 2 Single Wire Smart WiFi Dimmer Relay. Use of Shelly Bypass is required only if low energy lights are used in conjunction with smart relays (such as LED lights).
Specifically, if:
Shelly 1L is used with a light or other electrical device with a performance of less than 20W, or
Shelly Dimmer 2 is used with a light with a performance of less than 10W.
It is only required when the Shelly 1L or Shelly Dimmer 2 is used in single-wire installation, i.e. without a neutral wire.