[Main Function] The water level sensor records the minimum and maximum water tank levels. When installed on the top of the water tank, the transmitter measures the water level accurately using an ultrasonic sensor and monitors temperature with a built-in thermal sensor. [Convenient] The display shows both indoor temperature and water tank temperature simultaneously. The receiver can be placed on a table or mounted on a wall for convenient daily use. [Wide Range] Indoor temperature range: 0°C to 60°C; outdoor temperature range: -40°C to 60°C; temperature accuracy: ±1°C. Water level measurement range: 0 to 15 meters, resolution: 0.01 meters, accuracy: ±0.03 meters. [Multifunctional] The tank level gauge displays room temperature, tank temperature, and water level using a 10-segment LCD bar graph. It stores minimum and maximum records and allows setting alarms for high, low, or empty water levels. Wireless transmission range up to 100 meters (300 feet) in open areas. This water level sensor is easy to install and helps monitor water tank depth, water temperature, and indoor temperature. Features: - Displays tank level using a 10-element LCD bar graph - Stores minimum and maximum level records - Supports high/low water level alarms and empty tank alerts - Displays indoor temperature and tank temperature simultaneously - Receiver can be placed on a surface or wall-mounted Specifications: - Main material: Plastic - Color: White + Black - Indoor temperature range: 0°C to 60°C - Outdoor temperature range: -40°C to 60°C - Temperature accuracy: ±1°C - Water level measurement range: 0 to 15 m - Resolution: 0.01 m - Accuracy: ±0.03 m - Transmission frequency: 433 MHz - Transmission range: 100 meters (300 feet) in open area - Transmission interval: 30 seconds when level changes, 3 minutes when stable - Receiver battery: 2 x AA 1.5V LR3 alkaline batteries (not included) - Transmitter battery: 6 x AAA 1.5V LR6 alkaline batteries (not included) - Battery life: Up to 12 months for receiver and transmitter - Receiver dimensions: 105 x 93 x 25 mm (4.1 x 3.7 x 1.0 in) - Receiver weight: 93 g (3.3 oz) - Transmitter dimensions: 155 x 95 x 65 mm (6.1 x 3.7 x 2.6 in) - Transmitter weight: 125 g (4.4 oz) - LCD size: 66 x 45 mm (2.6 x 1.8 in) - Packaging dimensions: 165 x 110 x 105 mm (6.5 x 4.3 x 4.1 in) - Package weight: 288 g (10.2 oz) Package Contents: 1 x Water level sensor transmitter 1 x Indoor receiver 2 x Screws