3.6/3.7V Dual 18650 Rechargeable Lithium Battery Charger
sim7670c ic is good but it booting is very complication any other metod to connect 4G pius sms read and write
2A Dual L298N Motor Driver Module with PWM Control
MB20 - 20mm Average PCB Mounting CT
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An audio signaling device like a beeper or buzzer may be electromechanical or piezoelectric or mechanical type. The main function of this is to convert the signal from audio to sound. Generally, it is powered through DC voltage and used in timers, alarm devices, printers, alarms, computers, etc. Based on the various designs, it can generate different sounds like alarm, music, bell & siren.
| Minimum sound level | 85db |
| Oscillation frequency | 4KHz ± 500Hz |
| Current consumption | Maximum 15mA |
| Operating voltage | 1.5 to 27 VDC |
| Tone | Continuous |