| Place of Origin | Guangdong, China | Brand Name | STM |
| Model Number | ibutton tm1990, ibutton checkpoint | color | black |
| Read/Write | read only | capacity | 64 bit |
| Produce style | Factory manufacturer | material | stainless steel encapsulation+ABS base |
| chip Type | TM1990A-F5 | feature | waterproof |
| temperture | -40°C - 85°C | key words | ibutton checkpoint |
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