Closed-air dynamic headphones from amPhones series that feature a built-in amPlug technology, originally found on the palm-sized headphone guitar amplifiers. These headphones can be plugged directly in the instrument, allowing the user to enjoy the clean sound of a classic US-made amplifier. They are created using headphone technology from Audio-Technica, the trusted headphones manufacturer. They can also be used as conventional headphones when the amplifier simulator is switched off. The headphones are equipped with 40mm drivers, providing playback frequency range of 20 Hz to 20 kHz, output sound pressure level of 97 dB and maximum input of 1000 mV. The amplifier section offers Dials (Gain, Tone, Volume, Effect) and Switch (Standby) controls, standard guitar input and an aux input. The amplifier section requires two AAA batteries for operation. The headphones feature a 1.3m long cable and come supplied with batteries and a 3.5mm-to-6.3mm plug adapter. Impedance: 49 Ohm. Dimensions: 195 x 160 x 50 mm. Weight: 230 g.