1.If your products is different frequency, they can't be linked each other.
2.The MHz 915 and MHz 868 are good at long distance transmission. But the transmission of WS6006 depend on cellular network, so we keep MHz433 at this product only.
3.Most of customer using MHz433 in Australia, so we have to sell MHz433 in Amazon AU.
4.Our amazon sales in different country:
| Frequency | Area | Amazon site |
| MHz915 | North America | US CA |
| MHz868 | Europe | UK DE IT |
| MHz433 | Oceania | AU |
| Country | Frequency | |||
| 920MHz | 915MHz | 868MHz | 433MHz | |
| Afghanistan | ✓ | |||
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| Ethiopia | ✓ | |||
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| France | ✓ | ✓ | ||
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| Germany | ✓ | ✓ | ||
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| Greece | ✓ | ✓ | ||
| Grenada | ✓ | |||
| Guatemala | ✓ | |||
| Guinea | ✓ | |||
| Guinea-Bissau | ✓ | |||
| Guyana | ✓ | ✓ | ||
| Haiti | ✓ | |||
| Honduras | ✓ | |||
| Hong Kong (different than China) | ✓ | |||
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| Iceland | ✓ | ✓ | ||
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| Indonesia | ✓ | |||
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| Israel | ✓ | |||
| Italy | ✓ | ✓ | ||
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| Nepal | ✓ | |||
| Netherlands | ✓ | ✓ | ||
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| Nigeria | ✓ | |||
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| Saint Lucia | ✓ | |||
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| Somalia | ✓ | |||
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| Tanzania | ✓ | ✓ | ||
| Thailand | ✓ | |||
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| Uganda | ✓ | |||
| Ukraine | ✓ | |||
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| United Kingdom (UK) | ✓ | ✓ | ||
| United States of America (USA) | ✓ | ✓ | ||
| Uruguay | ✓ | ✓ | ||
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| Vatican City (Holy See) | ✓ | ✓ | ||
| Venezuela | ✓ | ✓ | ||
| Vietnam | ✓ | |||
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| Zimbabwe | ✓ | ✓ | ||