Blue Mix-Fi Powered High-Fidelity Headphones (Built-In Amp) with FiiO E10K USB DAC Headphone Amplifier Bundle Ampridge it has a thin profile

it has a thin profile and is compressible to let the weight always stay close to your torso

6 transport control switches

Constructed of waterproofed canvas with high density closed cell foam throughout

• FiiO A1 Portable Headphone Amp (Black)

just a safer connection between two audio systems

Blue Mix-Fi Powered High-Fidelity Headphones (Built-In Amp) with FiiO E10K USB DAC Headphone Amplifier Bundle Ampridge it has a thin profileThe Blue Mix Fi Bundle are powered headphones that innovate on the traditional closed back, over ear headphone design with the incorporation of an internal all analog audiophile amplifier. This allows the headphones to work well with low output sources such as smartphones, tablets, and other mobile devices. The headphones can operate in passive mode without the headphone amplifier, in active mode with the amplifier, or in bass boost mode, which adds