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6-30V Relay Module Switch Trigger Time Delay Circuit Timer Cycle Adjustable Trigger OFF / ON Switch Timing Cycle for Arduino
$2.90
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5A DC-DC Adjustable Buck Converter XL4015 5V – 32V to 0.8V – 30V Step Down Power Supply Voltage Regulator Power Module
Price range: $4.50 through $4.90
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DS3231 IIC Module Precision Clock Module DS3231SN /DS3231M Memory Real Time 3.3V/5V For Raspberry Pi
Price range: $2.90 through $3.20
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3A UPS Module 5V 6V 9V 12V 15V 24V 15W 3.7V 4.2V Li-on Li-po Lithium Battery Charge and Discharge Board for WIFI Network Router
$4.90
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This product has multiple variants. The options may be chosen on the product page