AT89C2051 Powered Six Digit Clock Kit with Alarm Timer Stopwatch Function

Six Digit Clock Assembly Kit with AT89C2051 Preloaded Firmware DC 6-12V

Loud Red Alarm Siren Motor Driven Buzzer with 110 Decibel for Safety Alerts

Buzzer Alarm Microwave Oven Knob Timer Switch Adjustable up to 120 Minutes

Red Alarm Siren Noise Loud Motor Driven Buzzer for AC110V DC12V DC24V Use

15mm Detection Switch NPN PNP Output Options Reverse Polarity Protection

15mm Detection Switch Capacitive Proximity Switch NPN PNP Output Options

Buzzer Alarm Microwave Oven Knob Timer Switch Adjustable up to 120 Minutes