If the prospect of a flat battery before bedtime is turning you off smartwatches, the ZenWatch 2 from Asustek Computer might be a turn-on: Asus says it could last as long as four days on a single charge, with an optional external battery offering an additional half-day boost.

The Taiwanese electronics maker took the wraps off a prototype of what will be the follow-up to its $199 ZenWatch on the fringes of the Computex tech expo on Monday. But it held back on the specs, pricing and availability, saying the device hasn’t been finalized yet.

Echoing the looks of the Apple Watch and also incorporating a metal crown, the ZenWatch 2 is designed to be a fashion accessory, with two sizes of 49mm and 45mm, aimed at men and women respectively.

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