ULTRA THIN ROBOT VACUUM CLEANER WINDOW CLEANING ROBOT. WINDOW CLEANER ELECTRIC GLASS REMOTE CONTROL. I’m glad you like this product. Please note that this product needs to be plugged in, not for charging. This one cannot be used for charging. The battery inside the robot is used to support the safety device to prevent falling. The whole machine has passed CE, FCC, ROHS quality testing and certification. The power supply passes the CCC, CE, FCC, UL, ROHS safety testing and certification. 1 Power cord + adapter. 2 Pairs of cleaning rings (4). 1 Extension of 4 meters. 1 Manual (or English manual). Wait 20 seconds after starting up until the blue light stop flashing. And then start working. Because the robot need 20sec to detect the glass plane. Binding the safety rope when using, Prevent falling from high altitude. Spray some water on the edge of the Mop when working, will be better effect. End to end tracking update. International buyers please note. We will try our best to reduce the risk of the custom. We will swap for a good one. (Public holidays not included).