iHold AP USB/SD On Hold Music Player - mp3 Music & Message on Hold Player for all PBX / KSU or key system telephones or any phone with audio input connector New Product - Music and messages On Hold for all multi-line PBX / ksu phones, more compact, not bulky, not heavy - easy to install with Dual Output RCA and 1/8" jack (3.5mm) connectors. Latest technology - works great even when customers use a cell phone (other brands the music portion is cutting out with static on the line) | superior sound quality on any phone system with "MOH" connector input Preloaded USB Flash drive with over 50 mp3 files included, Plug and play - hours of royalty free music and standard thank you for holding messages -- Built-in speaker - Monitor the audio on the device directly via the built-in speaker - Place on a shelf or easily mount to any surface via built-in wall mount. Auto Start -Auto play after power loss. automatically starts playing after power is restored and plays out of USB drive or SD card ( SD card not included) 3 year parts & labor warranty, includes - Free Audio Music editor & Recorder software for PC (Windows 10, 8, 7, Vista, XP) and Mac, 256MGB USB thumb drive preloaded with hours of royalty-free music, rca cables, 1/8" connector, wall mount screws, power adapter 110 / 220 VAC - 5VDC @2000mA and manual