On most airlines, yes. The Laser Egg contains a Lithium battery, so depending on your airline, you can pack the Laser Egg into your carry-on, but not into your checked luggage.
Laser Eggs can be used in any country or region in the world. For more accurate readings, pair your Laser Egg with the Kaiterra app under the same Wi-Fi network and update your location. Check to see if the Kaiterra app is supported where you live. If not, stay updated on new app versions as we’re constantly adding more stations.