In depth comparison and review of Koss UR 23i and Poly Voyager 4220 Office (UC Series). Compare design, audio features, functions and other important specifications to easily choose the right headphones for you. Our goal is to help you uncover differences between the products and find the headphones that will best fit your needs.
| DESIGN AND DIMENSIONS | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Product Type | Headphones - wired - 3.5 mm jack | Headset - Bluetooth - wireless - USB-C | |
|---|---|---|---|
| Series | - | UC Series | |
| Weight | - | 150 g | |
| Colour | White | Black | - | |
| Recommended Use | Portable electronics | - | |
| Bluetooth Range (Operating Distance) | - | 30 m |
| SOUND QUALITY | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Headphones Form Factor | Full size | On-ear | |
|---|---|---|---|
| Connectivity Technology | Wired | Wireless | |
| Wireless Technology | - | Bluetooth | |
| Bluetooth Version | - | Bluetooth 4.1 | |
| Bluetooth Profiles | - | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 20 - 20000 Hz | Both headphones offer the same frequency response. |
| Sensitivity | 94 dB | 94 dB | Both headphones offer the same sensitivity. |
| Impedance | 34 Ohm | 32 Ohm | |
| Diaphragm | - | 32 mm | |
| Features | - | SoundGuard Technology |
| MICROPHONE | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Type | On-cable | Boom | |
|---|---|---|---|
| Microphone Operation Mode | - | Uni-directional | |
| Microphones Included | - | 2 |
| REMOTE CONTROL | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Controls | - | Mute, volume, answer/end, play/pause, next/previous track |
|---|
| CABLE | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Cable Type | Headphones cable - 1.22 m | - |
|---|
| FEATURES | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Features | - | Voice alerts |
|---|
| BATTERY AND CHARGING | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Battery Type | - | Headset battery rechargeable - lithium polymer | |
|---|---|---|---|
| Battery Capacity | - | 360 mAh | |
| Battery Life | - | 12 hour(s) | |
| Battery Life Details | - | Continuous playback: up to 15 hours Continuous talk: up to 12 hours |
|
| Standby Time | - | 312 hours | |
| Charging Time | - | 1.5 hour(s) |
| CONNECTIONS | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Connector Type | Headphones (mini-phone stereo 3.5 mm 4-pole) | - |
|---|
| OTHERS | Koss UR 23i | Poly Voyager 4220 Office (UC Series) |
|---|
| Included Accessories | - | Wireless headset system base, Bluetooth USB-C adapter | |
|---|---|---|---|
| Service & Support | Limited warranty - lifetime | - |
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