The Veho Pebble PZ-6 Rugged power bank uses WYG high-performance 21700 Li-on cells. The cells are 40% more energy efficient than traditional power banks allowing PZ-6 to have a smaller form factor. The 20W fast charging. via the PD universal USB-C charging port. will charge most portable devices with up 12V output (all smartphones. tablets and most mini notebooks). A compact and lightweight design. with a silicone outer sleeve. provides splash protection making it perfect for travelling.