The Roborock E4 is a highly rated budget-friendly vacuum cleaner robot that offers impressive cleaning performance. It features a powerful suction system that can effectively clean both carpets and hard floors. The E4 has a runtime of up to 200 minutes, making it suitable for larger homes. It uses advanced mapping technology to navigate your home and avoid obstacles. The E4 can be controlled through the Roborock app, which offers scheduling options and cleaning mode customization. It also works with voice assistants like Amazon Alexa and Google Assistant. Users praise its long battery life and thorough cleaning capabilities. If you're looking for a budget-friendly robot vacuum with extended runtime, the Roborock E4 is a great option.