What does 30+ on Roman charging treasure mean?

The charging speed is increased by 30%. Roman charging treasure is a Type-C two-way fast-charging large-capacity mobile power supply, which supports PD3.0 protocol, and 30+ means that the charging speed is increased by 30%. Charging treasure refers to a device that can directly charge mobile devices and has its own storage unit. The main types of multifunctional charging treasures in the market are basically equipped with standard USB output, which can basically meet various digital products such as mobile devices, mobile phones, MP3, MP4, PDA, PSP, Bluetooth headsets and digital cameras.