 |  | |
| Available colors | ||
| Editiorial reviews | ||
| User rating |
 Westone 4 |  Westone UM PRO 20 | |
|---|---|---|
| Sound output | Stereo | Stereo |
| Style | In-Ear | In-Ear |
| Connectivity technology | Wired | Wired |
| Headset (integrated/enclosed microphone) | no | yes |
| Westone 4 | Westone UM PRO 20 | |
|---|---|---|
| Colour of product | Black |
|
| Acoustic design | Closed | Closed |
| Attachment type | Ear canal | Ear canal |
| Body material | Plastic | Foam |
| Category | Sport | Audiophile |
| Water resistant | no | no |
| Noise isolating | yes | yes |
| Westone 4 | Westone UM PRO 20 | |
|---|---|---|
| Weight | 4.8 oz | 0.45 oz |
| Westone 4 | Westone UM PRO 20 | |
|---|---|---|
| Channels | 2 | 2 |
| Impedance | 31.0 Ω | 27.0 Ω |
| Sensitivity | < 118 | < 119 |
| Frequency range | 10 - 18000 | 20 - 18000 |
| Driver technology | Balanced | Balanced |
| Simulated surround sound | no | no |
| Westone 4 | Westone UM PRO 20 | |
|---|---|---|
| Inputs supported | 3.5mm | 3.5mm |
| Cable length | 1.28 | 1.3 |
| Westone 4 | Westone UM PRO 20 | |
|---|---|---|
| Noise-canceling | no | no |
| Playback controls | yes | no |
| Built-in heart rate monitor | no | no |
| Calorie counter | no | no |
| FM radio | no | no |
| NFC | no | no |
| Vibration | no | no |
| Carrying case | yes | no |
| Pros | ||
|---|---|---|
| Cons |
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