Blackberry has launched a distinctive handset featuring a square screen and a keyboard that offers both physical keys and touch-enabled gesture controls.
黑莓发布一款独具特色的手机，该手机配有一方形屏幕和一块可以同时提供物理按键与触摸手势功能的键盘。
The Passport's unusually wide screen makes it possible to see the full width of documents in larger type than in rivals
It said work-focused users in particular should benefit from the Blackberry Passport's innovations.
Sales of the company's handsets - which are powered by its own operating system - have been in decline.
Analysts said the new device should appeal to existing Blackberry owners but might struggle to win over others.
The Canadian company's chief operating officer said the handset's release was part of a broader turnaround strategy led by John Chen, who became chief executive in November.
"You're going to see us be very focused," Marty Beard told the BBC.
"Potentially, in the past we got a little too broad a little too aggressively.
"Our target segment is more enterprise-focused. It's the power professional. It's someone who wants to be productive.
"Those users tend to be in regulated industries like banking or healthcare or government. We know those segments really well - in a way it's getting back to the Blackberry roots."
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