-FT005 Product function introduction:1. Backlight on/off function. Time function 12H/24H system (default display when powered on: 0:00 24 hours) 2. Transmitter low battery reminder. Alarm function (default display when powered on: 0:00) 3. Buzzer on/off (the buzzer function is turned on or off only for the key sound, the alarm mode is not affected by this). Indoor temperature C/F (default C) 4. Data signal indication. Water tank temperature C/F (Default C) 5. Water tank water level display unit: meter/foot (power-on default: meter). Water tank liquid level high/low alarm mode Alarm sound on/off display, default on Alarm duration: 120 seconds High/low water level display Water level depth analog display on 10-element LCD bar graph Receiver indoor temperature range: 0C~50C/-32F~122F Transmitter water tank temperature measurement range: -40C~60C/-40F~140F Water level measurement range: 1~5m Temperature resolution: 0.1C Accuracy: 1C Water level resolution: 0.01m Accuracy: 0.05m Transmitter protection level: IP65 (effective protection from rain splashes from any direction) Wireless transmission distance: 100 meters in open space Screen size: 4.3 inches Salt test; (-20C-60C) high and low temperature test; Power supply (batteries are not included in delivery): Receiver: 3*AAA battery power supply/TYPE-C power cable power supply; Transmitter: 6*AAA battery power supply Material: ABS colour: White Package Contents: 1 x receiver 1 x transmitter 1 cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.