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Package Included: 1*Detector Specifications: WIFI smoke detector Environmentally friendly, flame retardant, safe and durable Responsive and stable performance All-round smoke detection, keenly catching smoke Able to accurately detect 24 hours a day Built-in high-decibel speaker Applicable to a variety of scenarios, on-site alarm Description: Need three AA lithium batteries Installation method: Ceiling type Communication method: wireless Product size: 11*10.1*4.5cm