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4 working modes can be switched at will: 1. Instant mode = fast mode:WKMD, 1,30(real-time tracking when using the device, upload data every 30 seconds, upload frequency is 30 seconds-120 seconds) 2. Super power saving mode = roll call mode:WKMD,2,0(when not using the device, use this mode. Upload data through APP roll call function) 3. [...]