Valcom's Digital Message-On-Hold unit uses standard cassette tapes and features: Automatic Tape Loading Mechanism, Automatic Reloading After Power Failures, Lighted Displays for Easy Operation, Compact Solid State Design in an Industrial Steel Enclosure, Enhanced sound Quality, Power supply included; Specifications: Memory Type: Dynamic Random Access; Audio Bandwidth; 3.4 kHz with APHEX Aurel ExciterÖ circuitry; Audio Input: Electronically Controlled Built-In Cassette Deck; Power Requirements: Power Supply Included; Shipping Weight 6.1 lbs (2.77 kg) Dimensions: 9.0" H x 5.7" W x 2.2" D (22.86 cm x 14.47 cm x 5.58 cm)