40 USB port chargers are high-quality, best performance, and are stable. Very suitable for hotels, bars, factories, schools, hospitals, and family use. Not only connecting cushions, tablets, smartphones, MP3 players, USB port products, etc. It can also charge 40 mobile phones or other electronic products. With 100 % charging compatibility, compatible with iPad, iPhone, iPod, mobile phone, digital camera, Bluetooth headset, MP4 player, and GPS charging compatibility. Built-in intelligent multiple security protection. Over-current, overvoltage, short circuit, and high-temperature protection.