Features: Wide Compatibility: Support for iOS and Android devices and BT 2.0 or above enabled devices. Easy to Use: Open the cover and put the printed side downawards. Long Standby: With lithium battery, longer service life. It can standby up to 7 days and work continuously for 6 hours. Portability: With light weight and smart shape, you can take it everywhere with you without feeling tired, and more convenient for handheld printing, especially for those delivery merchants. 2 ways to connect: USB via computer, BT via phones. Environmentally Friendly: All it needs is rolls of thermal printing paper without using ink damaging environment. Nice Printed Quality: Clear and tidy. It could support up to 8 devices or 8 apps at the same time.