JoyRoom JR-D129
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| Brand: | JoyRoom |
| Description: | Capacity: 4000 mAh |
| Type: | Portable accumulator |
| Housing material: | Plastic |
| Capacity: | 4000 mAh |
| Input voltage: | 5 |
| Built-in battery type: | Li-Polymer |
| Input connectors: | micro USB |
| Output connectors: | USB Type-A |