# Buzzers and Alarms

> Active and passive buzzers, siren modules and warning lights for alarms and audible notifications

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/buzzers-and-alarms
- Category: Mechatronics and IoT > Sensors and Modules > Audio and Sound > Buzzers and Alarms
- Prices: RON, VAT included; prices and stock as of 2026-10-22 03:25 (Europe/Bucharest)

## Products (11)

### Siren module, 120dB, 6-15VDC
- Page: https://sigmanortec.ro/en/siren-module-120db-6-15vdc
- Details: https://sigmanortec.ro/en/llms/p/2266.md
- Price: 18.66 RON
- Availability: In stock; 1-2 zile
- Reference: 88130 · EAN: 5942211142344
- Specifications: tension: AD

Compact siren module for alarm and anti-intrusion systems, model QSI-4840. Power supply 6-15VDC, sound level up to 120dB (sound index 110dB at 12VDC), frequency 2.8 ± 0.5kHz, current consumption 750 mA at 12VDC. Dimensions 39 x 47 x 23 mm, suitable for integration into audible warning systems.

### Active Buzzer Module with LED, for PixHawk PX4, alarm, 3.3V
- Page: https://sigmanortec.ro/en/active-buzzer-module-with-led-for-pixhawk-px4-alarm-33v
- Details: https://sigmanortec.ro/en/llms/p/2211.md
- Price: 29.43 RON
- Availability: In stock; 1-2 zile
- Reference: 88050 · EAN: 5946683990533
- Specifications: Input Voltage: 3.3 V

Active buzzer module with red LED for PixHawk PX4, used as an alarm for low battery, failsafe or signal loss. Powered at 3.3V, includes a button for manual shutdown, connects via the Buzzer and Switch interfaces. Dimensions 15 x 38mm, weight 7g. Helps locate the drone after an uncontrolled landing. Reference 88050.

### Alarm siren with light and sound, 120dB, 5-12V
- Page: https://sigmanortec.ro/en/alarm-siren-with-light-and-sound-120db-5-12v
- Details: https://sigmanortec.ro/en/llms/p/2184.md
- Price: 23.23 RON
- Availability: In stock; 1-2 zile
- Reference: 88023 · EAN: 5949663991094
- Specifications: Input Voltage: 5-12 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Alarm siren module with flashing light and 120dB acoustic signal, for anti-burglary systems and automations. Power supply 5-12V DC, flash frequency 150 times/min, ABS housing, weight 75g, dimensions 122 x 72 x 43 mm. Powered via red wire (positive) and black wire (negative), typically connected through a relay; do not power with more than 12V.

### Speaker Buzzer 3-24V, 100dB
- Page: https://sigmanortec.ro/en/speaker-buzzer-3-24v-100db
- Details: https://sigmanortec.ro/en/llms/p/722.md
- Price: 4.19 RON
- Availability: In stock; 1-2 zile
- Reference: 33163 · EAN: 5942941745624
- Specifications: Supply Voltage: 3; Maximum Input Voltage: 24; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Piezo buzzer SFM-27-W for warnings and signaling in electronic projects and industrial applications. Power supply 3-24V DC, continuous sound up to 100dB at 12V/30cm, diameter 3cm, current consumption approximately 15mA at 12V, resonance frequency 2.5±0.5KHz. Operating temperature -20...+45C.

### Alarm siren 12V, 120dB
- Page: https://sigmanortec.ro/en/alarm-siren-12v-120db
- Details: https://sigmanortec.ro/en/llms/p/719.md
- Price: 20.09 RON
- Availability: In stock; 1-2 zile
- Reference: 33451 · EAN: 5949481699585
- Specifications: Input Voltage: 12 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Alarm siren powered at 12VDC, with a sound level of 120dB, intended for anti-burglary systems. The sound frequency is 3.8kHz +-10%, with a transmission rate of 3Hz for a distinct signal. It has a diameter of 54mm and a height of 48mm, a compact format easy to integrate into security projects.

### Buzzer mode active
- Page: https://sigmanortec.ro/en/buzzer-mode-active
- Details: https://sigmanortec.ro/en/llms/p/346.md
- Price: 3.63 RON
- Availability: In stock; 1-2 zile
- Reference: 33162 · EAN: 5942920248917

Active buzzer module (ref. 33162), compatible with Arduino and other development boards. Produces a continuous sound when supplied with 5V and can be controlled directly from a digital pin. Operates on LOW level activation, suitable for alarms and sound notifications.

### Passive Buzzer Mode
- Page: https://sigmanortec.ro/en/passive-buzzer-mode
- Details: https://sigmanortec.ro/en/llms/p/347.md
- Price: 5.03 RON
- Availability: Out of stock
- Reference: 22152 · EAN: 5949906098757

Passive buzzer module that requires a square wave signal with a frequency of 2k to 5k to operate. It can play varied tones or melodies using the Arduino tone function. Supply voltage 3.3-5VDC, dimensions 33 x 13 mm. It differs from an active buzzer, which generates sound directly when voltage is applied.

### Active buzzer 5v
- Page: https://sigmanortec.ro/en/active-buzzer-5v
- Details: https://sigmanortec.ro/en/llms/p/72.md
- Price: 3.82 RON
- Availability: In stock; 1-2 zile
- Reference: 22198 · EAN: 5940353170065
- Specifications: tension: AD; Input Voltage: 5 V

Active buzzer 5V (ref. 22198, EAN 5940353170065) for acoustic signaling in electronic projects. Emits sound immediately upon application of DC voltage, operates at 5V, does not require a PWM signal or complex driver. Voltage: DC, Input Voltage: 5V. Easily integrates with microcontrollers and 5V power sources, suitable for alarms, confirmations and sound notifications.

### Passive buzzer 5v
- Page: https://sigmanortec.ro/en/passive-buzzer-5v
- Details: https://sigmanortec.ro/en/llms/p/73.md
- Price: 1.45 RON
- Availability: In stock; 1-2 zile
- Reference: 33442 · EAN: 5943728665654
- Specifications: tension: AD; Input Voltage: 5 V

Passive buzzer rated at 5V, with 5 V input voltage and DC supply. Generates variable tones via PWM, offering fast response and clear sound. Compact size for easy integration, mounts via pins on breadboard or PCB. Suitable for audio signaling in Arduino projects, automation and electronics.

### Active piezoelectric buzzer 3-24V HND-2312
- Page: https://sigmanortec.ro/en/active-piezoelectric-buzzer-3-24v-hnd-2312
- Details: https://sigmanortec.ro/en/llms/p/74.md
- Price: 8.47 RON
- Availability: In stock; 1-2 zile
- Reference: 33164 · EAN: 5942208136028
- Specifications: tension: AD; Input Voltage: 3 - 24 V; Model: HND-2312

Active piezoelectric buzzer HND-2312, DC supply, input voltage 3-24 V. Operates directly at this voltage without an external circuit, providing a clear and stable sound for audible signalling. Low power consumption, suitable for battery or industrial power sources. Compact format, easy to integrate onto panels and enclosures, useful for alarms, status confirmations and simple warnings in electronic projects and automation.

### LED warning light, red, 12V
- Page: https://sigmanortec.ro/en/led-warning-light-red-12v
- Details: https://sigmanortec.ro/en/llms/p/307.md
- Price: 28.23 RON
- Availability: In stock; 1-2 zile
- Reference: 33387 · EAN: 5943606431500
- Specifications: Input Voltage: 12 V

Red LED strobe light for clear visual signaling of moving or working equipment, 12VDC power supply, flashing mode for increased visibility, compact body 73 x 43.5 mm without base. Quick to mount with included kit, screws and two bases, one with self-adhesive pad and one for screw fixing.
Strobe light (beacon), red color, 12V power supply. The kit includes screws and 2 bases, one with a self-adhesive pad, the other for screw mounting. The light is ideally used as a visual signal for moving equipment or equipment in operation.
Specifications:
Power supply voltage: 12VDC
Light source: LED
Light mode: flashing
Dimensions mm: 73 x 43.5mm (without base)