Pay close attention to your outdoor water tank in your own comfortable living room, up to 100m away You can hang the receiver unit on the wall or pull out the stand and place it on the kitchen table or table Simultaneously display the indoor temperature (°F or °C) and the water tank temperature (°F or °C) View your room temperature, water tank temperature, and water level (represented by a bar graph of 10 elements) You can store minimum/maximum records and set specific water levels (high/low) or empty time alarms Specifications: Material: plastic Receiver size: 10.5 x 9.3 x 2.5cm Transmitter size: 15.5 x 6.5 x 9.5cm Indoor temperature range: 0~60°C Outdoor temperature range: -40~60°C Temperature accuracy: ±1 Water level measurement range: 0~15m Resolution: 0.01m Accuracy: +/-0.03m Transmission frequency: 433MHz Transmission range: 100 meters (300 feet, barrier-free)? Transmission interval: 30 seconds when the level changes or 3 minutes when the level does not change Receiver battery: 2 x AA 1.5V LR3 alkaline batteries (not included) Transmitter batteries: 6 x AAA 1.5V LR6 alkaline or lithium batteries (not included)