Description: Keep an eye on your outdoor water tank from the comfort of your own living room, up to 100m away. Installed at the top of your water tank, the transmitter unit measures the water level using an ultrasonic sensor and temperature using a thermo sensor. You can hang the receiver unit on a wall or pull out the stand and place it on your kitchen bench top, table or desk. View your room's temperature, tank temperature and water level (represented by a 10 element bar graph). You can store min/max records and set alarms for specific water levels (high/low) or when empty. Specification: Indoor Temperature Range: 0~60℃ Outdoor Temperature Range: -40~60℃ Temperature Accuracy: ±1oC Water Level Measure Rang: 0~15m Resolution: 0.01m Accurate: +/-0.03M Transmission Frequency: 433MHZ Transmission Range: 100 meters(300 feet)in open area Transmission Interval: 30s when level changes or 3 minutes when level does not change Receiver Battery: 2X AA 1.5V LR3 Alkaline batteries (Not included) Transmitter Battery: 6X AAA 1.5V LR6 Alkaline or lithium batteries (Not included) Battery Life: Minimum 12 months for receiver Minimum 12 months for transmitter Package Includes: 1 x Water Level Sensor Transmitter 1 x Indoor Receiver 2 x Screws (Batteries are NOT included)