Hidden four-wire design, widely compatible, upgraded antioxidant technology, plug life longer. Applicable to a variety of models, charge your mobile phone at any time, and go out without a cable. Intelligent fast charging, charge whenever and wherever you want, no power outage worries. Polymer battery, safe and durable. Compact body, curved edge body, similar to the skin feel of the frosted shell, light luxury texture, can not help but let you hold in the palm of your hand. Made from abs material, measuring 5.59*2.76*0.79 inches, this custom self-contained 4-wire fast-charging power bank 20,000mah. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization available: Print your logo or customize packaging and color schemes. Product Highlights: Compact size, lightweight, easy to carry.