XDB307-2 & -3 & -4 mndandanda wa ma transmitters amawunikira amapangidwira kuti agwiritse ntchito mufiriji, pogwiritsa ntchito zida za ceramic piezoresistive sensing cores zomwe zimasungidwa m'mipanda yamkuwa. Ndi mapangidwe ophatikizika komanso osavuta kugwiritsa ntchito, komanso singano yopangidwa mwapadera ya vavu yolumikizira doko lopondereza, ma transmitterwa amawonetsetsa kuti magetsi amagwira ntchito bwino komanso kukhazikika kwanthawi yayitali. Amapangidwa kuti akwaniritse zofunikira za ma compressor a firiji, amagwirizana ndi mafiriji osiyanasiyana. Amagwiritsidwa ntchito kwambiri m'makampani opanga mpweya ndi firiji, transmitter imapereka miyeso yolondola komanso yodalirika.