New high impedance crystal earphone - very sensitive and works great with crystal radios. Has 3 a foot cord and miniature (3.5 mm) plug. MADE IN TAIWAN

Product Measurements by Type:

Bottom Diameter: 0.39 in.

Capacitance: 15,000 pf

Connector: 3.5 mm

Depth: 1.21 in.

Frequency Range: 200 Hz - 8,000 Hz

Impedance: 20 kΩ

Operating Temperature (TJ): -20°C to 60°C

Resistance: 20 MΩ

Sensitivity: 57 dB @1KHz

Top Diameter: 0.91 in.

Wire Length: 42 in.