Why is Free 2S better than KH-CRZ20T?
- Water resistance (IPx)IPx7 vs IPx4+75%
- Charging time1.5 h vs 2 h+33%
Why is KH-CRZ20T better than Free 2S?
- Battery life7 h vs 7.5 h+7%
Specifications
Side by side
| Sound | ||
| Fit | In-ear | Semi-in-ear (open) |
| Ear cup design | — | Open-back |
| Driver size | — | 11 mm |
| Lowest frequency | — | 20 Hz |
| Highest frequency | — | 20,000 Hz |
| Spatial / 3D audio | Yes | — |
| Noise control | ||
| Microphones | 4 | — |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 7 h | 7.5 h |
| Total with charging case | 30 h | — |
| Battery capacity | 40 mAh | — |
| Charging time | 1.5 h | 2 h |
| Wireless charging (case) | Yes | — |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.2 | 5.1 |
| Bluetooth codecs | SBC | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | No | No |
| aptX | No | No |
| LDAC | No | No |
| USB-C | Yes | — |
| Latency | 60 ms | — |
| Low-latency game mode | Yes | — |
| Design & build | ||
| Earbud weight (each) | — | 4.1 g |
| Protection rating | IPX7 | IPX4 |
| Water resistance (IPx) | IPx7 | IPx4 |
| Features | ||
| Touch controls | — | Yes |
| Hands-free calls | — | Yes |
