It was no where mentioned in product details that it has to be charged through a USB cable. If at all this Mosquito Bat needed to be charged with a USB cable, then I am of the opinion that such a cable has to be part of the product. I am supposed to use cellphone's charger for it. But as I have an iPhone my charger is not compatible for it. So I am unable to use it till I arrange a suitable charger.
Secondly, this product has a manufacturing date of year 2018, and it means the life of its Li-Ion batteries is more or less near expiry. Why do you sell/ deliver an old product?