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Features: This eliminate wasting money on replacement charging cords. Both can be use for Wireless Phone Car Charger and Car holder. Â·Smart charging indicator Â·Comply with the QI standard of the WPC. Â·Over 73% efficiency and low calorific value. Â·Automatic standby after full charge. Â·Intelligent-identification of metal foreign body. Specification: Input voltage: 4.75-6.0V Input Current: 2A Max Maximum current: 3A Maximum protection current: 10-30mA Receiving distance: 3-8m Operating temperature: -10 ~ 40 â Color: Black Base removable, suitable for desktop and car Gross weight: 225g Net weight: 141.5g Product Certification: Appearance of the patent, CE, FCC, RoHS Principle Introduction: Wireless charging technology, it is also known as inductive charging, relying on the induction between the coils. The current through the coil which produces magnetic resonance, and then through the coil converted into current. The device produces the magnetic field which is called transmitting terminal, and the another device converts current which is called receiving end. So as long as your phone has the built-in receiver, wireless transmission can be achieved. If not, you should buy a wireless receiver for matching the usage.Regarding Samsung Note 8 ‘please read below’ 1, Please make sure you use the plug unit that comes with charger.2. Samsung has released a new note8 mobile phone system that can improve wireless charging performance. Make sure the phone’s system is up-to-date 3, Samsung note8 need to use the corresponding charging head to work properly (original Samsung Note 8 adaptor) 4, Samsung note8 phone back shell is relatively thick, when charging is best not to use an additional phone shell my iPhone