Oraimo is a reputable company focused on creating quality products with a guaranteed warranty. Their device comes in different capacities and models and the power capacity is measured in milliAmpere Hour or mAh. All Oraimo power packs are equipped with Oraimo's exclusive chip, AniFast  This feature called “AniFas” can intelligently identify the fast-charging protocol of your devices to deliver the speediest possible charge. Also, all Oraimo products support a premium Lithium polymer chip and this is not just safe, but also has a higher conversion rate, stable voltage, and reliable circuit protection.  In other words, it means Oraimo portable device can withstand overcharging, over-discharging, and other faults, offering reliable protection for both the power bank and devices.  This makes Oraimo products safe to use any time any day Interestingly, their products are rugged and long-lasting, with many testifying to having been using them for years.