The Veho Pebble PZ-12 rugged power bank uses WYG high-performance 21700 Li-ion cells. The cells are 40% more energy efficient than traditional power banks, allowing the PZ-12 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 to 12V output, including all smartphones, tablets, and most mini notebooks. Its compact and lightweight design, with a silicone outer sleeve, provides splash protection, making it perfect for traveling.