This multifunctional water level sensor is easy to install and use, can detect water tank depth, tank temperature, indoor temperature, etc. It is a practical water tank sensor. Features: This meter monitors tank liquid depth level, and displays on a 10-element LCD bar graph. It can keep min/max records of tank liquid level. Supports tank liquid level high/low alarm and tank liquid empty alert. Displays indoor temperature ( or ) and tank temperature ( or ) at the same time. The receiver can be put standing on desk or hanging on wall. Specifications: Main material: plastic Color: white+black Indoor temperature range: 0~60 Outdoor temperature range: -40~60 Temperature accuracy: ±1 Water level measurement range: 0~15m Resolution: 0.01m Precision: ±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: 2 * AA 1.5V LR3 alkaline battery (not included) Transmitter battery: 6 * AAA 1.5V LR6 alkaline battery (not included) Battery life: minimum 12 months for receiver, minimum 12 months for transmitter Receiver size: 105 * 93 * 25mm / 4.1 * 3.7 * 1.0in Receiver weight: 93g / 3.3ounce Transmitter size: 155 * 95 * 65mm / 6.1 * 3.7 * 2.6in Transmitter weight: 125g / 4.4ounce LCD size: 66 * 45mm / 2.6 * 1.8in Package size: 165 * 110 * 105mm / 6.5 * 4.3 * 4.1in Package weight: 288g / 10.2ounce Package List: 1 * Water Level Sensor Transmitter 1 * Indoor Receiver 2 * Screws