GC-10002 Large Headphones with volume control 100mw Max Input Power Key Specifications/Special Features: Large comfortable domes covers ears completely. Optional accessory for metal detectors Drive unit: 40mm diameter dome Impedance: 32Ohms Frequence response: 20-20,000Hz Sensitivity: 105dB S.P.L. at 1KHz Max input power: 100mw Cord length (cm): 180+/-3% 1 year distributor warranty in the USA. Repair or replacement for the original purchased with proof of purchase date.