The SM-T300, from Star Micronics, is a mobile printer for smartphones.
"This is a printer you can carry with you. It can be used outdoors for mobile purposes. For example, it can print from an iPad, smartphone, or Android device."
The SM-T300 has a rubber-type case that can withstand being dropped from 1.5 meters. It's also waterproof and dustproof, meeting the IP54 international standard.
"Basically, this product is for printing receipts and delivery slips. The battery lasts up to 11 hours, so you can use this printer for a long time. It communicates with the host device through Wi-Fi or Bluetooth. We offer a special-purpose communication support library for sending data."
The SM-T300 also comes with a magnetic card reader as standard. So it can be used to issue receipts for delivery services, and to bill for simple transactions at events.