| Brand | Haylou |
| Model | Watch 4 |
| Device Type | Smartwatch |
| Release Date | 22 July 2025 |
| Status | Available |
| Operating System | Android |
| OS Version | v9.0 |
| Display Type | TFT |
| Screen Size | 1.93 inches |
| Resolution | 320x380 px |
| Height | 47.6 mm |
| Width | 38.8 mm |
| Thickness | 11.8 mm |
| Weight | 45 grams |
| Colors | Black, Silver |
| Waterproof | Waterproof |
| IP Rating | IP68 |
| Ruggedness | Dust proof |
| Yes | |
| Text Message | Yes |
| Incoming Call | Yes |
| Alarm | Yes |
| Calendar Reminder | Yes |
| Timer | Yes |
| Weather | Yes |
| Battery type | Li-Ion (Lithium Ion) |
| Capacity | 300 mAh |
| Placement | Non-removable |
| Network | N/A |
| WLAN | No |
| Bluetooth | v5.3 |
| GPS | Yes with A-GPS, Glonass |
| Loudspeaker | Yes |
| Made By | China |
| Features | Heart rate sensor, motion sensor, blood oxygen sensor |
