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It worked with it’s initial charge and then stopped. The gadget is supplied with a USB charging cable. It could not be charged at all. The instruction manual is poorly made. I took it apart and found out that the battery inside is 7.4 v 2AH battery, there is no way this device will directly charge with any USB cable or any standard 5V USB charger. I had to develop one home-made charger of my own and finally managed to charge. But then not everyone can design a Li battery charger at home I guess this can be extremely annoying experience.
The original USB charging cable doesn't work after one month so I bought two sets of USB cable from local shops but both USB cable cannot charge the vacuum cleaner. Now I am using third party AC/DC power supply converter to charge the unit. I don't understand why new USB cable cannot be used to charge the vacuum cleaner.