Description: This headphone adopts high performance chip. It has high sensitivity and stability without frequency hopping. With LCD display, you can easily adjust to the frequency point you want, it's clear and intuitive. The headphone is ideal for use at school. It will deliver high-fidelity sound to your ears precisely and you will make less mistakes caused by objective factor expecially in an examination. Order it! Specifications: Color: Black Material: ABS Frequency Range: 50-108MHz Frequency Reponse: 200Hz-20000Hz Receiving Sensitivity: ≤18dB Distortion: ≤1% Working Voltage: 3V Battery: 2 * AA Battery Channel Selection: Automatic, Manual Cable Length: 1m Package Weight: About 224g Package List: 1 * Headphone 1 * Audio Cable 1 * User Manual