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| Regional areas: | 3-4 business days | 
| Remote areas: | 3-5 business days | 
| USB input | DC5V/2A (not Included) | 
| (USB power and dry batteries can not be used in the same time) | |
| Input voltage | DC3V AAA x 2 Included | 
| Quiescent current | 75uA | 
| Alarm current | 60mA | 
| Low voltage and undervoltage | 2.2V | 
| WiFi | 802.11b/g/n | 
| Detection temperature | -10-55 | 
| Detection humidity | 0-99%RH | 
| Alarm sound pressure | 55dB | 
| Installation method | wall-mounted | 
| Working temperature | -10-60 | 
| Working humidity | maximum 90%RH |