The headphones shall be a circumaural, closed-back design with a self-adjusting headband. The headphones shall be designed for monitoring on location or in noisy environments. The headphones shall meet the following performance criteria: frequency range: 16 to 20,000 Hz, sensitivity: 96 dB SPL at 1 mW, electrical impedance: 32 ohms, power handling capability: 200 mW. The headphones shall be fitted with a 3 m single cable terminated in a 1/4" adapter jack. The net/shipping weight of the headphones shall be 241/488 g (8.4/17.1 oz.).