INCLUDED - MH-4 4-Way Headphone Amplifier, 12 VDC Power Supply, Mackie 1 Year Limited Warranty, and Turnstile Audio TAPH100 Studio Monitor Headphones for a complete audio solution. SUPERIOR SOUND QUALITY - Experience crystal-clear audio with the HM-4's optimized circuitry, ensuring pristine sound reproduction for monitoring and playback across all four channels. ENHANCED OUTPUT POWER - Drive multiple headphones with robust output, providing ample volume and clarity for individual listeners without compromising audio integrity or detail. VERSATILE CHANNEL COUNT - Four independent 1/4' stereo headphone outputs allow for simultaneous monitoring by multiple users, ideal for studio sessions, live sound, or collaborative projects.