The Blue Mo-FI Headphones ($350) are built for true music fans. The come in a little heavy, 16.5 ounces, but that’s to be expected they contain an onboard audiophile amplifier which provides some of the most accurate sound production you’ve every heard. Whether your using a smartphone, or high-end equipment, the Mo-Fi will improve the sound by reducing the audio workload on your device. The included battery will charge in 3-4 hours and provide you with about 12 hours of playtime. And if the battery dies the headphones will continue to play in passive mode. Additional features include a 10Hz – 20kHz frequency response, 50mm titanium reinforced dynamic drivers, and an overall impedance of 42 ohms.