Feature: 1. LCD DISPLAY: Aquarium thermometer has a 2.17 inch LCD display with a reading range of 0‑49°C and a large transparent LCD screen that does not block the view of the ornamental fish tank and keeps the overall aesthetics. 2. TEMPERATURE ALARM: When high or low temperature is triggered, the buzzer will beep continuously for 5 seconds and then stop, and the temperature will keep flashing until the temperature is below the set value. 3. SET THE TEMPERATURE: Open the battery cover, press H, each press increases by 1°C, up to 49°C, then cycle from the lowest settable alarm temperature value. The setting is displayed directly on the screen. 4. DURABLE MATERIAL: Fish tank temperature sensor combines the formability of ABS with the mechanical nature of PC, high temperature resistance, UV resistance, eliminating problems such as color loss without spraying shell. 5. EASY TO USE: Aquarium fish tank thermometer can be directly attached to the outside of the fish tank after tearing off the glue, with hidden button design, no probe and miscellaneous lines in the water, to ensure the cleanliness and beauty of the fish tank. Specification: Item Type: Aquarium Thermometer Material: ABC, PC Battery Type: CR2032 Button Cell (Shipped with Built in Battery) Battery Capacity: 240mAh Product Size: Approx. 7.5x5.7cm / 3.0x2.2in. Package List: 1 x Aquarium Thermometer Note: All data are measured manually, and there are certain errors in the measurement results.