Clarifications & Features: * The Philips Response Simply Simple Go Mini is the best in its class in terms of a strong and reliable portable oxygen concentration, which provides a 1 liter pulse flow. * Designed to meet the requirements of daily active patients. * Lightweight portable oxygen of 2.7 kg with a long battery. * Li-ion battery with up to 9 hours operating capacity. * Easy to use and read touch LCD screen. * Five pulse dose settings designed to keep you on the road. * Zigzag design, shock resistant. * Simple replaceable / removable rechargeable battery. * Elegant bag to carry by hand or over your shoulder.