Purchased on a flight between Hong Kong and Japan. The battery has been replaced twice. Everything was working fine. The battery is currently dead. It's been 3 to 6 months since it stopped working. There is no box. If sold separately, it's 2000 yen each. Instant purchase is OK. If you would like to purchase with batteries included, it will be an additional 1500 yen per item. *Please note that it will take 2-3 days to ship after purchase.