iHold A2LPro "All-In-One" Professional 2-Line Music On Hold Player system for all regular corded or cordless 2 line or 4 line telephones or PBX key system phones | Music On Hold adapter plus mp3 USB On-Hold Music player in one device Music and messages On Hold with Favorite Track Repeat function, more compact - not bulky, not heavy - easy to install with both telephone jacks and RCA jack connector | "all-in-one" Music On Hold system with 1 click current track repeat function & 1 click Holiday mode switch | works with all 2 line or 4 line corded or cordless phones or all multi-line PBX key system phones Superior sound quality on any phone system with or without "MOH" connector input, Pre-loaded USB flash dirve included (SD slot provided, SD card not included) | Auto Start -auto play after power loss, automatically starts playing after power is restored and plays out of USB drive or SD card | 1 click switch to play out of USB or SD card so convenient! Activates via Flash button then Hold on any regular 1 to 4 line telephones, Activates via Hold on many compatible 2 to 4 line phones, Activates via Hold on any PBX or system phones on as many lines Preloaded USB Flash drive with over 33 mp3 files included, Plug and play - hours of royalty free music and standard thank you for holding messages plus many easy style office music | 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 included 1 year parts & labor warranty, includes - Free Audio Music editor & Recorder software for PC (Windows 10, 8, 7, Vista, XP) and Mac, 128MGB USB Flash (thumb) drive preloaded with hours of royalty-free music, 1 phone cord, wall mount screws, power adapter 110 / 220 VAC - 5VDC @1500mA and manual