Following the launch of its $50 subscription-free security camera last month, Shelly announced another new accessory for smart home automation today that can keep track of multiple people as they move through rooms or large spaces without recording them. The Shelly Presence Gen4 sensor uses mmWave radar technology instead of a camera to detect the presence, motions, and activities of people and pets. It's available starting today for $84.99 through Shelly's online store and is expected to hit other retailers like Amazon and Best Buy soon.
The Presence Gen4 can be perched on a shelf or a table using its built-in stand or permanently mounted …