The Spark Chamber Apollo, part of PEMF Complete's analog device series, features high-powered spark chamber technology and adjustable intensity for versatile therapeutic applications. Specifications: Model: 12KS2500 Analog/Spark-Gap Chamber Design Includes Two Attachments: 14" Large Single Loop, 9" Double Butterfly Dimensions: 12.8" W x 14.6" H x 8.7" D Weight: 33.1 lbs Time Duration Options: 5, 10, 15, or 20 minutes Intensity: Variable Dial Made for USA and International Power Compatibility What's Included: Large single loop attachment 9" double butterfly attachment