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| Product | Koss PortaPro (with Case)  | Koss 143396 Wireless System (Black) | Sennheiser CC 520 (with Ultra Noise-Canceling Microphone & Boom) | Maxell Kids Safe (Black) |
| Price | $35.83 to $59.99 | $38.67 to $113.13 | $127.89 to $259.83 | $6.95 to $81.42 |
| CNET editors' rating | 4 stars | Info unavailable | Info unavailable | Info unavailable |
| Average user rating | 4 stars | 0 stars | 0 stars | 0 stars |
| Release date | January 1, 1984 | Info unavailable | Info unavailable | Info unavailable |
| Bottom line | 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. | Info unavailable | Info unavailable | The Maxell Kid Safe KHP-2 headphones are a standard model made specifically for kids. They are small in size and limit the volume coming from an audio source. |
| Product Description | Koss PortaPro - Headphones | Koss HB 70 - Headphones | Sennheiser CC 520 - Headset | Maxell Kids Safe KHP-2 - Headphones |
| Packaged Quantity | 1 | 1 | 1 | 1 |
| Product Type | Headphones - Wired | Headphones - Wireless - Infrared | Headset - Wired | Headphones - Wired |
| Recommended Use | Portable audio system Home audio system | Home audio system | Corded phone | Portable audio system |
| Headphones Type | Headphones - Binaural | Headphones - Binaural | Headset - Binaural | Headphones - Binaural |
| Headphones Form Factor | On-ear | Behind-the-neck mount | Full size | On-ear |
| Connectivity Technology | Wired | Wireless - Infrared | Wired | Wired |
| Sound Output Mode | Stereo | Stereo | Info unavailable | Stereo |
| Audio Specifications | Frequency Response 15 - 25000 Hz - Sensitivity 101 dB/mW - Impedance 60 Ohm | Frequency Response 30 - 15000 Hz | Frequency Response 300 - 3400 Hz - Sensitivity 103 dB - Impedance 300 Ohm | Frequency Response 14 - 20000 Hz - Sensitivity 90 dB - Impedance 32 Ohm |
| Remote Control | None | None | None | None |
| Full specifications | Full specifications | Full specifications | Full specifications | Full specifications |
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Koss QZ-2000 compare
