音声検索 (Onsei Kensaku) is an iPhone application developed by Yahoo Japan Corporation. This app allows users to utilize various search services provided by Yahoo! JAPAN by simply speaking keywords into their iPhone. With its intuitive features, users can easily perform voice searches without the need for touch operations or text input.

One of the key features of 音声検索 is its ability to perform searches using voice recognition. Users can speak their search queries, and the app will execute the most appropriate search based on the content. This saves users time and effort, especially when they are on the go and need quick access to information.

The app offers multiple ways to initiate a search. Users can choose to use the call-style method, shake their device, or simply say "ねぇヤフー" (Hey Yahoo) to start a search. Additionally, users can select different search modes using voice commands or by swiping the screen left or right.

Other notable features of 音声検索 include a long-press microphone button to access the menu, customization of voice recognition through a user dictionary, and on-device voice recognition with low latency.

Overall, 音声検索 is a convenient and user-friendly voice search app that enhances the search experience for iPhone users. Whether you're looking for images, maps, or train schedules, this app provides a seamless and efficient way to access Yahoo! JAPAN's search services through voice commands.