Type: Upgrade Kit Specifications: Included USB Flash Drive - 128MB Maximum Memory Supported – 2GB Supported audio standards – MP3 Supported bit rates – 32–320kbps USB Flash Drives Supported – All standard up to 2GB Interface – USB 2.0 Audio output mode – mono (analog) Built-in monitor speaker Software included – MessageStudio v.3 - Windows Controls/Switches: Volume/Power; Monitor speaker on/off; Impedance 8/600 ohm; RCA audio output; 2.5mm trigger switch input Power: 9VDC @ 500mA; Source -110/220 VAC Size: 7" x 5.5" x 3" Weight: 4 lbs. Housing - Industrial Grade Anodized Aluminum Wall mountable Features: 128MB USB Flash Drive - Load new MP3 audio from any Mac or PC. PC connection...strictly optional - Unit uses PC only to update content stored on USB Flash Drive. Rugged Anodized Aluminum Enclosure - Toug...