wireless car charger has over-voltage protection, over-temperature protection, magnetic field protection, short-circuit protection, if the device is abnormal, it will automatically stop working. – Do not over-squeeze or hit the device. – Do not use the wireless charger under severe high temperature, humidity or corrosive environment to avoid damaging the device’s circuit. – It only works when the automobile power is on. – There are a little sound of the telescopic clip when powered on, please understand. *100% Brand new and high quality *Fully automatic car wireless charging *Infrared induction + 360°rotation provides *Silicone suction cup,Easy to intall and release on vehicles windshield and Dashboard *Air inlet shelf ,Quick and easy installation on your air vents *High wireless charging efficiency, all new smart control chip ensures a high conversion rate *Short-circuit protection of the receiver to avoid overcharge & overheating, security and reliable How to use this wireless car charger? Step 1: Connect the wireless car charger and power with the cable, it will auto check the tension and the blue indicator light will be on.