The Sequencer is a communication aid that allows you to record and play back messages in sequence. The Sequencer has 3 minutes of record time, 90 seconds per level. Each level is recorded independently. Can also be used as a single-message device! The Sequencer has an external switch jack, an external speaker jack and a relay jack for cause-effect. All jacks accept standard 1/8" (3.5mm] plugs). The Sequencer has excellent sound quality and a long battery life. Includes one 9-volt battery. Dimensions: 3.5 in x 3.5 in x 2.25 in. Weight: 10 oz.