Compared with the window cleaning robots on the market, this product has the advantage that it can be operated without a remote control machine.    Dear buyers,    Glad you like this product. Please note that this product needs to be plugged into a power source and cannot be charged. This cannot be used for charging. The battery inside the robot is used to support the safety device to prevent falling.    Packing list:  1 host  1 power cord + adapter,  1 remote control  1 pair of batteries  2 pairs of cleaning rings (4)  1 extend 4 meters  1 safety rope  16 cleaning cloths  1 manual (or English manual)  1 after-sales warranty card    Operation steps of window cleaning robot:  1. Wait 20 seconds after starting, until the blue light stops flashing, and then start working. Because the robot needs 20 seconds to detect the glass plane.  2. Tie a safety rope when using it to prevent it from falling from a height.  3. Spray some water on the edge of the mop when working, the effect will be better.  4. After receiving the item, if you have any questions, please contact us and we will solve it for you.  (When you don't know how to use it, I will give you the answer and send you the operation video)