| Specification | Detail |
| Brand | Joyroom |
| Model | JR-OE4 |
| Series | Openfree Series |
| Type | Open-Ear True Wireless Headphones |
| Bluetooth Version | Bluetooth 5.4 |
| Wireless Range | Up to 10 meters |
| Audio Codecs | AAC, SBC |
| Speaker Driver Size | Ф16 mm Dynamic Driver |
| Speaker Impedance | 16 Ω |
| Frequency Response Range | 20 Hz – 20,000 Hz |
| Maximum Output Power | 20 mW |
| Water Resistance Rating | IPX4 |
| Earbud Battery Capacity | 80 mAh (each) |
| Charging Case Battery Capacity | 800 mAh |
| Music Playtime (Single Charge) | Up to 12.5 Hours (at 50% volume) |
| Total Playtime (with Case) | Up to 50 Hours (at 50% volume) |
| Charging Time | Approximately 3 Hours |
| Charging Interface / Input | USB Type-C (5V ⎓ 1A) |
| Materials | ABS + PC |
| Dimensions | 88.7 × 66.5 × 32 mm |
| Net Weight | 78.8 g (total) / ~10 g (single earbud) |
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