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Magnetic Reed module, 2 pieces, 5 VDC, white $ 6.25 6.25 USD	Vibration/Shock Sensor, module, 2 pieces, 5 VDC, white $ 5.25 5.25 USD	TDS sensor, for water quality, 3.3-5.5 VDC, measuring range 0-1000 ppm, cable length 60 cm, white $ 10.45 10.450000000000001 USD	Adjustable LM2577 voltage step-up module, boosts 3.5-35 VDC to 5-40 VDC $ 15.75 15.75 USD
DC-DC boost modules, stable 5V output for LiPo and Alkaline batteries $ 5.15 5.15 USD	Modbus RTU 3 Color Signal Light Visual Alarm for Workshop Machines and Industrial Equipment $ 22.95 22.95 USD	Modbus RTU Audible and Visual Alarm with 3 Color Signal Light3-for Workshop Machines and Industrial Equipment $ 29.95 29.95 USD	Rainproof PIR Motion Sensor Activated Audio Player (BLACK) $ 119.00 119.0 USD
Wet/Dry-Bulb Psychrometer Humidity Measurement Module 4-20mA $ 545.00 545.0 USD	Soldering kit, DIY, electronic decision maker, yes/no aid, doubt resolver $ 8.95 8.950000000000001 USD	Candidate 3: 0.3MP 640x480P VGA 30FPS 60FPS USB2.0 Camera Module with 90 degree lens and Holder $ 33.84 33.84 USD	SparkFun Qwiic OLED Display (0.91 in., 128x32) $ 11.95 11.950000000000001 USD
Candidate 1: 0.3MP 640x480P VGA 30FPS 60FPS USB2.0 Camera Module with 180 degree fish eye Lens and Holder $ 42.84 42.84 USD	MadLab ELECTRONIC KIT - Underwater ROV $ 99.00 99.0 USD	3.5in 8W 4ohm Speaker $ 13.95 13.950000000000001 USD	3G/4G SMS Alarm 16 Digital Input $ 569.95 569.95 USD
10 Watts Modbus RTU MP3 Sound Player in Enclosure $ 49.95 49.95 USD	Modbus RTU Audible and Visual Alarmwith 3 Color Signal Light $ 29.95 29.95 USD	FN-SPK1A USB Speaker Subwoofer for PC 3W 4 OHMS $ 12.95 12.950000000000001 USD	PIR Motion Sensor/Detector (White) $ 9.95 9.950000000000001 USD

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Kits and Modules