Ring Alarm Motion Detector vs Shelly Blu Motion

For a general indoor installation the Shelly Blu Motion takes it, with a wider 120-degree field, a longer 9 m range, a built-in lux sensor and a longer warranty. The Ring Alarm Motion Detector remains the better fit for an existing Ring Alarm system, where its Z-Wave pairing and pet-friendly detection are exactly what that ecosystem wants.

The radio and the bridge. The Ring Alarm Motion Detector is Z-Wave and needs Ring Alarm or a Z-Wave hub, while the Shelly Blu Motion is Bluetooth LE and needs another Shelly or a BLU Gateway. That single split decides which ecosystem each one fits, and it sits on top of the Shelly's wider coverage and light sensor.

No, neither is standalone. The Ring Alarm Motion Detector requires a Ring Alarm base station or a Z-Wave hub, and the Shelly Blu Motion requires another Shelly device or a Shelly BLU Gateway to bridge it to Wi-Fi.

No. The Shelly Blu Motion and the Ring Alarm Motion Detector are both indoor sensors with no weather resistance. Shelly owners who tried the Blu Motion under eaves report very limited range and spurious triggers, and the Ring unit is designed for mounting inside at around 7 to 8 feet.

The Shelly Blu Motion is rated for up to five years on a CR2477. The Ring Alarm Motion Detector runs on two AA batteries, and owners report years of use, but the published figure is not stated. Both are low-maintenance sensors that rarely need attention.

Buy the Ring Alarm Motion Detector if you already have Ring Alarm or a Z-Wave hub and want a pet-friendly sensor inside that system. Buy the Shelly Blu Motion if you run Home Assistant or Shelly hardware, want lux-based lighting automations, or need the widest indoor coverage for the money.