The item is a set of 50pcs NE555P highly stable timers integrated circuits, which are capable of producing accurate or oscillation. In the time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. Features - 50 pieces of the NE555P Highly Stable 555 Timers in one set will be sold together. - Model: NE555P. - Color: mainly black. - Material: durable hard plastic and metal. - Size:1.00X0.80X0.80cm/0.39X0.31X0.31in - and Highly Stable 555 Timers Modules - Timing from microseconds to hours. - Adjustable duty cycle. - Capable of producing accurate or oscillation. - Support astable or monostable operation. Package list: 50 * NE555P Highly Stable 555 Timers Modules for Generating Accurate & Oscillation (Black)