Among the most powerful portable headphone amps on the market, the Pico Power offers the highest sound quality of any amp in the Pico family. It delivers 18 volts of power and features a discrete diamond-buffer output stage with hand-matched transistors and current sources. Its low output impedance, very low noise floor, and three-way gain switch make it well suited for a wide range of dynamic headphones, from sensitive IEMs to full-size cans like the Sennheiser HD 800 and HiFiMAN HE series. Precision machined from a solid block of aluminum, the enclosure is complete with a satin finish and built to weather years of use. The included 9V alkaline batteries provide 40 hours of listening, and you can also swap in lithium rechargeable batteries (not included) for 30 to 50 hours of battery life per charge. Like the Pico Slim and the Pico DAC/amp, the Pico Power is made in the USA.