Radial Engineering Radial Catapult TX4L 4ch transmitter, balanced i/o, line-level transformers, uses shielded cat-5. Part of our AV Components range (microphones & conferencing), supplied through AV Distribution, an authorised South African distributor for professional audio, video and staging equipment. Available to order -- contact us for lead time. Contact our team if you need help confirming compatibility with your existing setup.