1 CHEAPEST vacuum robot cleaner.automatic working 2.low noise ,portable 3.self rechanging 4.pretect detector  vacuum robot cleaner 2.Stair avoidance detector 3.Virtual wall detector 4.Wall following sensor... Technical parameters>: Voltage 14.4V power 25W Noise 70dB Net Weight 2.1KG Carton size 370 * 345 * 150mm Gross Weight 3KG The first 11 hours battery life, charging time of 500 Dust container capacity of 0.14 liters normal 8-hour charge time Fan speed of 15,000 rev / min vacuum 1Kpa Filter area of 5500 mm2 single run time of 35 minutes Air flow 5 L / s   1. Circular dispatch styling, avant-garde fine, compact and lightweight, comfortable and safe. 2. With automatic navigation and intelligence function, press the switch to automatically clean the room. 3. Low-noise design, the noise only 70 dB, far below the normal vacuum cleaner. 4. Ultra quiet vacuum box and strong adsorption ability, you can easily clean and erase all kinds of impurities on the ground. 5. Ultra-thin body design, you can easily drill down to the table, furniture, couch, cleaning every corner of the room. 6. Front bumper design flexibility, can automatically avoid obstacles, meet resistance automatically returns. 7. Anti-drop design, to effectively prevent the machine falling stairs, tables and so on. 8. External dust collection box, taking convenience. Electrostatic filter can be reused. 9. Soft wheel design, wheel with soft material, will not scratch the floor or damage to the carpet. 10. Quality assurance. Products have passed CE certification, in line with European and American import standard.