Apex Electronics

The Apex HP65 Semi-open Dynamic Headphones are lightweight for maximum comfort and long-term wearability. High performance low-mass Ferrite magnet diaphragms deliver completely natural sound reproduction with unmatched clarity while a semi-open earpiece design allows comfortable listening without complete isolation from the environment.
Specifications:
Type: Semi-Open Dynamic Headphones
Frequency Response: 20Hz to 20,000Hz
Max SPL: 106dB (+/-3dB 1mW @ 1kHz)
Impedance: 32 ohms (+/- 15% @1000Hz)
Driver: 40mm Ferrite MagneT
Maximum Input Power: 100mW
Rated Input Power: 50mw
Cable Length: 2.5m / 8.0'
Connector: 3.5mm (1/8th-inch) Gold plated TRS jack
Weight: 189g / 6.7oz