short circuit
Despite of its portability, this product does not provide a very nice user experience when it was usable.<br />The reason I'm rating it one-star is, one day it occasionally turned on itself without me turning on the switch, and I cannot turn it off by flipping the switch. It's very likely that there's a short circuit caused by water leaking into the device. Since it could be dangerous if the battery is short-circuited, I discard it right away and write this review.<br /><br />Updated on 5/9/2017:<br />The seller quickly responded to this review and offered a refund. My appreciation to their support service brings this review to 3 star.
Rating: 3 stars