Features: Wireless Remote Screen: Monitoring your fridges from up to 100m away. Have confidences knowings your food is cold and readys whenever you need it. Custom-Audible Alarms: Fix the issue before it occurs. The custom-audible alarm alerts you when your fridges/freezer exceeds your set temperature limit. Multiple Mounting Options: Use the hook, stand or magnets to mount the remote display in multiple different locations. Ideal for moving around your campsite with eases. Dual Temperature Sensors: The dual temperature sensors work perfectly with the dual-zone fridges, allowing you to monitors multiple temperatures at the same time. Easy to read Display: The freezer thermometers has a large digit LCD screen. With this feature, you can easily monitors the temperature change of your refrigerator and provide double protection to your food safety. Notice: 1.Actual color may be slightly different from the image due to different and light effect 2.Please allow 1-3cm deviation due to manual measurement Host battery: 2 AAA batteries (not included) Transmitter battery: 2 AA batteries (not included) Wireless frequency: 433MHz Range: 100 meters without interference