Specification Brand : Jwthee BulletPoint1 : Without Oscillating Source: The passive buzzer module is no oscillator inside the passive, so if a DC signal is used, it cannot scream. A square of 2K~5K must be used to drive it. BulletPoint2 : Working Voltage: Passive buzzer module external connection of 3.3V‑5V voltage, the buzzer module can be directly connected with 5V micro controller and 3.3V micro controller.In some special cases, a control port can be multiplexed with the LED. BulletPoint3 : Controllable Frequency: The passive buzzer alarm module sound frequency is controllable, and the effects of Do, Re, Mi, Fa, Sol, La, Si can be made. BulletPoint4 : Easy to Install: The passive buzzer module is Equipped with fixture nuts for convenient mounting.Can share a control port with LED.The module is driven by 9012 transistor.Uses 3 pin control port. BulletPoint5 : High Quality PCB Material: The compact passive buzzer module is carefully manufacture by high quality PCB material, wear resistant, lightweight and durable. ExternallyAssignedProductIdentifier : 7629631881746 IncludedComponents : Electronic Components ItemName : Passive Buzzer Module,5 Pcs Passive Buzzer Module,Low Level Trigger Sound Module 3.3~5V 3 Pin Control ItemPackageDimensions_Height : 2.8 centimeters ItemPackageDimensions_Length : 10.9 centimeters ItemPackageDimensions_Width : 7.5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : sensor-blocks Manufacturer : Jwthee Material : Copper ModelNumber : BWP20-12--1 NumberOfItems : 1 PartNumber : Jwtheent3hez0p8r ProductDescription : Features: Passive buzzer without oscillating source inside, so if you use DC signal, you can't make it scream. It must be driven by a square of 2K~5K.The sound frequency is controllable, and the effect of ''do re mi fa so la si do'' can be made. In some special cases, a control port can be multiplexed with the LED.Equipped with fixture nuts for convenient mounting.The module is driven by 9012 transistor.Uses 3 pin control port. Specification: Item Type:Passive Buzzer Working Voltage:3.3~5V Small Printed Circuit Board Size:3.3 x 1.3cm / 1.3 x 0.51in Module Pin: VCC :to External 3.3~5V GND:to External GND I/O :to Microcontroller IO port