Features:  1. Radio transmission circuit and coding technology to solve the problem of signal port blocking.  2. A variety of temperature modes can be adjusted, suitable for different scenarios.  3. Wireless transmission of data signals, mobile phone remote monitoring.  4. Ultra-low power consumption, long battery life.  5. With low voltage monitoring and prompt function.  6. Regularly send online reports to the host.  7. Anti-demolition design in the field of professional security.  8. Split design, high reliability.    Specification:  Communication method: WIFI 2.4G;  Dimensions: 64X64X28mm;  Working temperature: -10~+55℃ 0~100%RH;  Power supply: DC 4.5V (not including 3 AA batteries);    Packing list:  1 * Temperature and humidity;  1 * Manual