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Pololu 1484 1485 9mm Electromagnetic Buzzer: 30Ω 40Ω, 3 7V 4 6V Lolin Node MCU base The larger heatsink should be The larger heatsink should be applied to the Broadcom BCM2837 processor located at the center of the board The RFbee operates as a plug and play wireless node that integrates RF transceiver hardware with Arduino compatible firmware Pololu 1484 1485 9mm Electromagnetic Buzzer: 30Ω 40Ω 3 7V 4 6V
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