The ONsite USB-C 150W PD Battery Pack boasts high-capacity Power Delivery (PD) that is required for USB-C charging devices such as MacBook Pro, MacBook Air, iPad Pro, phones and other devices. This ONsite powerhouse pack can charge two USB-C devices and one USB-A device simultaneously. Because photographers spend time shooting, editing and reviewing images using a portable laptop, the Tether Tools ONsite USB-C 150W PD 25,600 mAh Battery Pack has been designed to keep you powered all day long.