Smartwares manufactures the SH4-99557, a wireless switch operating at 433 MHz. This remote control system allows for convenient operation with three pieces included, ideal for managing lighting or small appliances. It is typically used to enhance home automation by remotely controlling devices. https://elecena.pl/product/28706006/smartwares-sh4-99557-fsk-433-mhz-wireless-receiver-set-3-remotes 2025-05-16 https://elecena.pl/product/28706006/smartwares-sh4-99557-fsk-433-mhz-wireless-receiver-set-3-remotes 2026-07-03