The Veho Pebble PZ-20 Rugged power bank uses WYG high-performance 21700 Li-on cells. The cells are 40% more energy efficient than traditional power banks allow PZ-20 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.