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The Shelly BLU Button 4 is a compact smart switch / wall adapter designed for home automation. It supports up to 16 customizable actions and advanced timing (short/long press) and uses Bluetooth 5.4 for connectivity with fast (10 ms) and scalable (30 ms) response options.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.