65. Restore to Factory SettingR311FA saves data including network key information, configuration information, etc. To restore tofactory setting, users need to execute below operations.1. Press and hold function key for 5 seconds till the green indicator flashes and then release; LEDflashes quickly 20 times.2. R311FA will be turned off mode after restoring to factory setting.6. Sleeping ModeR311FA is designed to enter sleeping mode for power-saving in some situations:(A) While the device is in the network → the sleeping period is Min Interval. (During thisperiod, if the reportchange is larger than setting value, it will wake up and send a data report).(B) When it is not in the network → R311FA will enter sleeping mode and wake up every 15seconds to search a network to join in the first two minutes. After two minutes, it will wake upevery 15 minutes to request to join the network.If it’s at (B) status, to prevent this unwanted power consumption, we recommend that usersremove the batteries to power off the device.7. Low Voltage AlarmingThe operating voltage threshold is 2.4V. If the voltage is lower than 2.4V, R311FA will send alow-power report to the Lora network.8. Installation(1) This product does not have a waterproof function. After the screening is completed, please placeit indoors.(2) The dust in the installation position of the equipment needs to be wiped clean and then affixed tothe equipment.(3) The battery installation method is shown in the figure below (battery with "+" facing outward).