Hi Yinuo, the performance of all Geeni devices will also depend on the WiFi signal. The device should be within 10 to 15 feet away from the WiFi router to ensure that the products will work at all times. For assistance, please reach us via email at
[email protected], phone +1 (888) 232-3143 from Mon-Sun, 7:00 AM to 12:00 Midnight EST.