As the weather gets colder, the demand for electric hand warmer is also increasing. At present, the electric hand warmer on the market converts electric energy into heat energy through electrodes, indirectly or directly heating the liquid inside the electric hand warmer. When the power is connected, the indicating light is on, indicates that the power is connected and heating is under way; The indicating light off indicates that the heating is complete or the power supply is not connected. In order to avoid the rising temperature of internal liquid caused by overcharging of electric hand warmer, resulting in explosion or combustion accidents, manufacturers will choose to place NTC thermistor for temperature monitoring and temperature protection, to ensure the safety of users.

Today, EXSENSE Electronics Technology Co., Ltd. introduces an electric hand warmer, which not only installs NTC thermistor as temperature protection element, but also has sound alarm, it can remind users to power off in time after the electric hand warmer finishes charging. This electric hand warmer includes light emitting diode, knob, housing, battery, alarm, fastener, NTC thermistor, aluminum plate and PCB board. The bottom plate of the housing of electric hand warmer is an aluminum plate with good thermal conductivity. The NTC thermistor is installed on the upper part of the aluminum plate. The NTC thermistor is connected in series in the circuit of the PCB board at the same time. The side of the housing is provided with light emitting diodes and knobs, and the groove on the upper part of the housing is embedded with a battery, which is composed of two +1.5V batteries in series to provide +3V DC power supply; The housing of the alarm is fixed to the surface of the electric hand warmer by a fixed buckle.

Electric hand warmer with alarm can not only send an effective warning message to the user when the temperature exceeds the preset value, prompt the user to cut off the power supply after charging finishes; But also install NTC thermistor to effectively prevent the explosion and combustion accident caused by the overheating caused by various reasons, increase the safety of use, bring great convenience to people's life.