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| Part Number | M031-A | M031-B | M031-Z | M031-C3 | M031-C4 |
| Manufacturer | M5Stack Technology Co., Ltd. | M5Stack Technology Co., Ltd. | M5Stack Technology Co., Ltd. | M5Stack Technology Co., Ltd. | M5Stack Technology Co., Ltd. |
| Series | - | - | - | - | - |
| Packaging | Retail Package | Retail Package | Bulk | Bulk | Retail Package |
| Product Status | Active | Active | Active | Obsolete | Obsolete |
| Type | Cellular | GSM | Transceiver; 802.15.4 (Zigbee®) | Transceiver | Transceiver; LoRa® (LoRaWAN®) |
| Frequency | 850MHz, 900MHz, 1.8GHz, 1.9GHz | - | 2.405GHz ~ 2.48GHz | 915MHz | 868MHz |
| Contents | Board(s), Antenna(s) | Board(s), Antenna(s) | Board(s), Antenna(s) | Board(s), Antenna(s) | Board(s), Antenna(s) |
| Utilized IC / Part | - | - | CC2630F128 | ASR6501 | ASR6501 |
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