This multi-functional water level sensor is easy to install and use, it can detect tank depth, tank temperature, indoor temperature etc. It is a practical tank water sensor. Functions: This gauge monitors the depth level of the liquid in the tank and displays on a 10-element LCD bar graph. It can keep records of the min / max liquid level in the tank. Supports high / low liquid level alarm and empty liquid level alarm. Displays the indoor temperature (℉ or ℃) and the tank temperature (℉ or ℃) at the same time. The receiver can be placed on a desk or on a wall. Technical data: Main material: plastic Color: white + black Indoor temperature range: 0 ~ 60 ℃ Outdoor temperature range: -40 ~ 60 ℃ Temperature accuracy: ± 1 ℃ Water level measuring range: 0 ~ 15m Resolution: 0.01m Accuracy: ± 0.03 m Transmission frequency: 433 MHz! Transmission range: 100 meters (300 feet) in open area Transmission interval: 30 seconds when the level changes or 3 minutes when the level does not change Battery life: minimum 12 months for the receiver, minimum 12 months for the 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 / 4.4. Screen size: 66 * 45mm / 2.6 * 1.8 inch Package size: 165 * 110 * 105mm / 6.5 * 4.3 * 4.1 in Package weight: 288g / 10.2ounce Package list: 1 * Water Level Sensor 1 * Internal receiver 2 * Screws 1 * transmissor do sensor de nível de água 1 * interno receptor 2 * Parafusos 2 * Viti