A lot of laptops and cell phones have have weak headphone audio output or they distort when you crank up the volume. An external headphone amplifier like this solves (or reduces) that problem (in some situations). This one is sturdily build and has a nice clean sound output in the volumes that I use. I love that it is rechargeable so you I don't have to worry about batteries or a fragile battery door, which was a common problem on older battery-powered headphone amplifiers.
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