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I am interested in sourcing a drone that can provide reliable performance in challenging environments. Specifically, I'm looking for a model capable of sustained flight for a minimum of 2 hours while carrying a payload of up to 50 kg. This drone needs to be suitable for operations in Angola, where conditions can vary significantly. Could you provide detailed specifications, including battery life, flight range, and any advanced features such as GPS or obstacle avoidance? Additionally, I'd appreciate it if you could include your pricing structure, lead times, and warranty details. Looking forward to your prompt response with the relevant information!