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| Product | Sennheiser PX 100-IIi Headset (Black) | Koss PortaPro (with Case)  | JVC Flats (Black) | Sennheiser PX100 (Black) |
| Price | $89.95 | $44.99 to $59.99 | $10.62 to $14.99 | $175.99 |
| CNET editors' rating | 4 stars | 4 stars | 4 stars | 3.5 stars |
| Average user rating | 4 stars | 4 stars | 4.5 stars | 4 stars |
| Release date | Info unavailable | January 1, 1984 | November 22, 2010 | November 15, 2002 |
| Bottom line | Despite their lightweight structure, the Sennheiser PX100-IIi headphones are surprisingly powerful, and we recommend them for travelers, students, and anyone else shopping for new open-backed headphones. | Koss hit a home run with the PortaPros. Love or hate the design, there's no denying the sound quality here: they're the ideal companion for mobile audiophiles and home theater enthusiasts. | Though they look a little cheap, the JVC Flats are lightweight, comfortable on-ear headphones that sound surprisingly good for sub-$15 headphones. | The PX100 is a good choice for travelers seeking a compact headphone design. |
| Product Description | Sennheiser PX 100-III - Headset | Koss PortaPro - Headphones | JVC HA S160-B | Sennheiser PX 100 - Headphones |
| Packaged Quantity | 1 | 1 | 1 | 1 |
| Product Type | Headset - Wired | Headphones - Wired | - Wired | Headphones - Wired |
| Recommended Use | Cellular phone Portable audio system | Portable audio system | Cellular phone Portable audio system | Portable audio system |
| Headphones Type | Headset - Binaural | Headphones - Binaural | Binaural | Headphones - Binaural |
| Headphones Form Factor | On-ear | On-ear | Info unavailable | On-ear |
| Connectivity Technology | Wired | Wired | Wired | Wired |
| Sound Output Mode | Stereo | Stereo | Stereo | Stereo |
| Audio Specifications | Frequency Response 15 - 27000 Hz - Sensitivity 114 dB - Impedance 32 Ohm | Frequency Response 15 - 25000 Hz - Sensitivity 101 dB/mW - Impedance 60 Ohm | Frequency Response 12 - 24000 Hz - Sensitivity 103 dB/mW - Impedance 32 Ohm | Frequency Response 15 - 27000 Hz - Impedance 32 Ohm |
| Manufacturer Warranty | 2 years warranty | Limited lifetime warranty | Info unavailable | 2 years warranty |
| Remote Control | Info unavailable | None | None | None |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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Sennheiser PX 100-IIi Headset compare (Black)
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