英国采购需求：迈翼电子，电子产品，定制电子产品，定制电子解决方案，电子制造商，电子制造商服务

I'm looking for a reliable tracking solution for my livestock, specifically for cattle and sheep. The device needs to function effectively in areas without internet access, as I operate in remote locations. I'm particularly interested in a tracking chip or device that can be discreetly implanted inside the animals to ensure maximum security. It's crucial that the device is not easily visible to prevent theft or tampering. I want something durable and designed for long-term use within the animals, allowing me to monitor their location without attracting the attention of potential criminals. Please let me know if you have such products available and any relevant details about their capabilities and features.