INKBIRD Bluetooth Thermo-hygrometer ITH-11-B (3 Packs), Temperature and Humidity Monitor with Bluetooth APP Remote Control, Ultra Long Battery Life, IP65 Waterproof for Home Reptile Refrigerator

Upgraded Bluetooth 5.0: It has advanced Bluetooth 5.0 technology, so you can control it with your smartphone within a long open distance of 80 meters (262 feet). It also features the Firm Update function, which means it can be functionally updated based on your feedback.