The series sports safety features such as over-voltage, over-current, and short circuit protection.Tech specs:Ray 05/10/20 — Grade A Polymer Battery, Over 300 times cycle life, Thread Pattern Design, Multiple Protections to avoid electric fault, Type-C USB and micro USB Input, 5000mAh / 10000mAh / 20000mAh battery, DC 5V/2.4A output, DC 5V/2.The Ray series power banks can be recharged using both USB Type-C cable and micro USB cable, helping the user to conveniently use the same cable to charge the phone and the external power bank. The ultra-lightweight and slim power banks feature multiple safety protection and comes in three variants — Ray 5, Ray 10, and Ray 20..    China Cables Wire Manufacturers The ultra-lightweight and slim power banks feature multiple safety protection and comes in three variants — Ray 5, Ray 10, and Ray 20.Ray series power banks can be recharged using both USB Type-C cable and micro USB cable.4A output. Ray 5 serves as a pocket-sized power bank, whereas the colossal 10000mAh Ray 10 and Ray 20 can charge two devices simultaneously, serving as an ideal travel companion. Riversong launches Ray series power banks for mobile devices.