The UGREEN Nexode PB502 10000mAh Two-way Fast Charging Power Bank (30W) is a premium, pocket-sized portable battery that provides high-speed Power Delivery (PD) charging for smartphones, tablets, and lightweight laptops like the MacBook Air. Its defining feature is two-way 30W fast charging, which allows the power bank to charge external devices rapidly and refill its own internal cells from empty to full in just about 2 hours when using a 30W wall adapter.