Attention??? Please make sure that the store you purchased is NUM7 For your shopping experience, please be sure to confirm the store and purchase. Thank you for your support! Heunwa Electricity Saving Box Specification Rated voltage: 90V-250V Rated frequency: 50Hz-60Hz Useful load: 30,000W Illustration for using When using,plug into any sockets,no need to maintenance. Assure of the pluging,the indicated light is in a condition of lighting. Plug into any sockets or line of prolonging,use one or several power energy saver according to the quantities of devices. Notice *When using,please be careful when pluging into the sockets.Don’t be too rude.Avoid damage. *After using,don’t take off too often.avoid influencing the result of saving electricity. *Don’t let the kids touch it.Assure the safety. Heunwa Suggestion A high-power device with one device works best. If your home include air-conditioner, refrigerator, television and so on, we suggest 2 or 3 pcs.