RDM6300 125Khz EM4100 RFID Reader Module UART Output Access Control System for arduino

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PL2303 USB To UART TTL Converter Mini Board LED TXD RXD PWR 3.3V/5V Output Serial Module

SD / TF Card Shield Slot Reader Expansion Board Module for Arduino

10 PCS 125KHz TK/EM4100 Proximity ID Card Chip Keychain Key Ring(Black)

Arduino ESP8266 Uart Serial to 802.11 Wifi Wireless Module

SD / TF Card Shield Slot Reader Expansion Board Module for Arduino

YX6300 UART TTL Serial Control MP3 Music Player Module Support Micro SD/SDHC Card For AVR/ARM/PIC 3.2-5.2V Geekcreit for

125KHz Keyfob RFID Copier Smart Card Reader USB Tag Reader Writer

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OPEN-SMART® 4Pcs Big Key Button Module Kit Active High Level Output for Arduino

ESP01 Programmer Adapter UART GPIO0 ESP-01 CH340G USB to ESP8266 Serial Wireless Wifi Development Board

USB Serial Adapter CH340G 5V/3.3V USB to TTL-UART RobotDyn for Arduino - products that work with official Arduino boards

Low Level 5V 1/2/4/8 Channel Solid State Relay Module SSR G3MB-202P 240V 2A Output with Resistive Fuse for Arduino

OPEN-SMART® LM386 Sound Sensor Voice Detection Sensor Module with Analog/Digital Double Output for Arduino

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Factory Price AT-09 Bluetooth 4.0 UART Transceiver compatible HM-10 CC2541 Module for Arduino Reply Soon

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125khz EM4100 TK4100 Wristband RFID Bracelet Silicone RFID Band Read Only No Printed Black