KOKKIA iAmplifier: Tiny Headphone Amplifier Splitter, with Remote & Mic pass-through Extremely tiny size and light-weight at 10mm X 15mm X 45mm and 8.5g (0.39 X 0.59 X 1.77 and 0.3oz) with high performance and unique features. No other portable headphone amplifier device comes even close to this size or weight or features. Drives your headphones with clear and high quality music/audio. Designed to include Splitter function, to drive 2 headphones at the same time, with similar high performance for the 2 headphones. iAmplifier provides additional pass-through remote control and microphone functions by using 4-pole audio jacks/sockets, unlike most other designs that use only 3-pole audio jacks/sockets. Remote control and microphone pass-through allows either or both headphones with remote control to control music/audio device and/or talk to music/device. Firm attachment (no unwieldy dangling cord), tiny size, elegant design, features and performance makes iAmplifier an awesome mate to your music device.