H-Tronic Interface Modules Wireless transmitter 624631 - H-Tronic 1618150, Manufactured by H-Tronic, the HT1S wireless transmitter operates at a frequency of 868.35 MHz and is powered by a 3 V supply. It offers a maximum range of 150 meters in open fields, making it ideal for wireless control applications. Typical uses include controlling wireless sockets and switches in domestic or commercial settings. H-Tronic 1618150 HT1S 1-Channel 868.35MHz 150m Secure Wireless Tx