ZRS-33 is a part of Carmedia, a proprietary entertainment and navigation system developed by Carmedia for use in automobiles. It is a multifunctional radio receiver head unit designed to replace standard factory car stereos. The unit operates as an all-in-one audio player, CD changer, AM/FM receiver, MP3 and DVD player, and navigational system. The ZRS-33 includes a built-in LCD touch-screen display along with convenient retractable antenna. It is equipped with built-in Bluetooth hands-free calling and audio streaming support, as well as many other unique features. It is fully compatible with third-party audio alignment, subwoofer integration, and rear-view camera installation.