3 ms·It could be, but it is probably just they have enough backup power to send the signal.by cbsmith 7y agoIt could be, but it is probably just they have enough backup power to send the signal.judge2020 7y agoIt's more likely that the device sends a heartbeat every minute or so, either for notifications or just for this "device is offline" feature.halbritt 7y agoIn this case, no.