diff --git a/etc/ugreen-lets.conf b/etc/ugreen-lets.conf
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+
+# configuration file for ugreen-diskiomon and ugreen-netdevmon
+# it should be put in /etc/ugreen-leds.conf
+
+# =========== parameters of disk activities monitoring =========== 
+
+# The method of mapping disks to LEDs: ata, hctl, serial
+#      ata: default, also used in UGOS
+#           $> ls -ahl /sys/block | grep ata[0-9] --color
+#           * you should check whether it will change after reboot
+#
+#     hctl: mapping by HCTL, 
+#           $> lsblk -S -x hctl -o hctl,serial,name 
+#           it will fail in some devices if you have USB disks inserted, but works well otherwise
+#           * you should check whether it will change after reboot
+#           ** see https://github.com/miskcoo/ugreen_dx4600_leds_controller/issues/14
+#
+#   serial: suggested, mapping by serial
+#           this method requires the user to check the disks' serial numbers
+#           and fill the DISK_SERIAL array below (see the comments therein).
+MAPPING_METHOD=serial
+
+# The path of the compiled diskio monitor (OPTIONAL) 
+# BLINK_MON_PATH=/usr/bin/ugreen-blink-disk
+
+# The path of the compiled standby monitor (OPTIONAL) 
+# STANDBY_MON_PATH=/usr/bin/ugreen-check-standby
+
+# The sleep time between disk standby checks (default: 1 seconds)
+STANDBY_CHECK_INTERVAL=1
+
+# The serial numbers of disks (used only when MAPPING_METHOD=serial)
+# You need to record them before inserting to your NAS, and the corresponding disk slots.
+# If you have 4 disks, with serial numbers: SN1 SN2 SN3 SN4, 
+# then the config below leads to the following mapping:
+#    SN1 -- disk1
+#    SN2 -- disk2
+#    SN3 -- disk3
+#    SN4 -- disk4
+DISK_SERIAL="44D0A02BFVGG 33J0A05PF94G Y250A0DBF94G BTYF0174002R480BGN"
+
+# The sleep time between two disk activities checks (default: 0.1 seconds)
+LED_REFRESH_INTERVAL=0.1
+
+# brightness of disk LEDs, taking value from 1 to 255 (default: 255)
+BRIGHTNESS_DISK_LEDS="255"
+
+# color of a healthy disk (default: 255 255 255)
+COLOR_DISK_HEALTH="255 255 255"
+
+# color of an unavailable disk (default: 255 0 0)
+COLOR_DISK_UNAVAIL="255 0 0"
+
+# color of a disk in standby mode (default: 0 0 255)
+COLOR_DISK_STANDBY="0 0 255"
+
+# color of a failed zpool device (default: 255 0 0)
+COLOR_ZPOOL_FAIL="255 0 0"
+
+# color of a device with unhealthy smart info (default: 255 0 0)
+COLOR_SMART_FAIL="255 0 0"
+
+# Check the disk health by smartctl (default: true)
+CHECK_SMART=true
+
+# The sleep time between two smart checks (default: 360 seconds)
+CHECK_SMART_INTERVAL=360
+
+# Check the zpool health (default: false)
+CHECK_ZPOOL=false
+
+# The sleep time between two zpool checks (default: 5 seconds)
+CHECK_ZPOOL_INTERVAL=5
+
+# The sleep time between two disk online checks (default: 5 seconds) 
+CHECK_DISK_ONLINE_INTERVAL=5
+
+
+# =========== parameters of network activities monitoring =========== 
+
+# Blink the netdev light when sending data (default: 1)
+NETDEV_BLINK_TX=1
+
+# Blink the netdev light when receiving data (default: 1)
+NETDEV_BLINK_RX=1
+
+# A cycle of netdev blinking (default: 200 milliseconds)
+NETDEV_BLINK_INTERVAL=200
+
+# color of the netdev under the normal state (for CHECK_LINK_SPEED=false)
+COLOR_NETDEV_NORMAL="255 165 0"
+
+# The sleep time between two netdev connectivity / link speed monitoring (default: 60 seconds)
+CHECK_NETDEV_INTERVAL=60
+
+# Monitor the gateway connectivity (default: false)
+CHECK_GATEWAY_CONNECTIVITY=false
+
+# Monitor the link speed (default: false)
+CHECK_LINK_SPEED=false
+
+# brightness of the netdev LED, taking value from 1 to 255 (default: 255)
+BRIGHTNESS_NETDEV_LED="255"
+
+# color of the netdev under different link speeds (for CHECK_LINK_SPEED=true)
+COLOR_NETDEV_LINK_100="0 255 0"
+COLOR_NETDEV_LINK_1000="0 0 255"
+COLOR_NETDEV_LINK_2500="255 255 0"
+COLOR_NETDEV_LINK_10000="255 255 255"
+
+# color of the netdev when unable to ping the gateway
+COLOR_NETDEV_GATEWAY_UNREACHABLE="255 0 0"