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433 MHz Wireless Modules: Set of 3 RF transmitter and receiver modules for wireless signal transmission in compatible DIY electronics, remote control and automation projects Versatile Applications: Suitable for a range of projects including wireless switches, lighting controls, alarm systems, remote controls and other compatible electronic applications Compatible With Popular Platforms: Designed for use with compatible Arduino and Raspberry Pi devices, making the modules suitable for hobby electronics, prototyping and DIY projects Optional External Antenna: Reception range can be improved by attaching a suitable copper wire to the designated ANT contact point. External antenna or copper wire is not included Pack of 3: Includes 3 compact 433 MHz transmitter and receiver modules, giving you multiple modules for experiments, prototypes or different electronics projects