Winbest Metal Detector Headphone 193874. Features of Winbest Metal Detector Headphone: Adjustable padded headband Padded ear cushions Single sided long cord with volume control Over-the-ear design Delivers crisp audio No batteries needed Speaker Size 40mm Frequency Range 20-20000Hz Speaker Impedance 32 Ohm Speaker Sensitivity 100dB +/- 3dB Connection 3.5mm Cable Length 6.56ft/2m Package Contents: Winbest Metal Detector Headphone Winbest 193874: Metal Detector Headphone