TP-Link Tapo Smart Temperature & Humidity Monitor. Purpose: Indoor, Sensor type: Temperature & humidity sensor, Type: Freestanding. Battery type: CR2450, Battery life (max): 2 year(s). Width: 46 mm, Depth: 12.3 mm, Height: 46 mm. Package width: 66 mm, Package depth: 85 mm, Package height: 26 mm. Compliance certificates: RoHS