II.in [美 ɪn, 英 ɪn]副in often appears as the second element of certain verb structures in English (close in, hand in, stand in, etc). For translations, see the relevant verb entry (close, hand, stand, etc).
Often, parents, mistaking the strip's intent, would encourage their own children to send in submissions to what they thought was a kids' participation feature.
Other than implementing a trade-in system, where customers can send in their old electronics to the original manufacturer, the rest of the company's products are difficult to keep track of.