This Buzzer is suitable for PCB mounting and producing audible tones and frequencies. It can be directly connected to a v micro controller pin. It can be used with arduino as well. It can be used for making DIY robots. This buzzer has loud sound output with low power consumption.

Thermistor are  mostly  used  to monitor the temperature of battery packs while charging,The resistor whose resistance is dependent on temperature There ate two type of thermistors PTC,NTC.PTC  is used as timers in the degaussing coil circuit of most CRT displays. . PTC  is  used  as heater in industryWe can use PTC thermistors as current-limiting devices for circuit protection, as replacements for fuses, NTC  are used to monitor the temperature of an incubator.