Google has notified some users selected under its Glass Explorer testers program that some of the $1,500 glasses were being produced and shipped in phases, according to reports.
The battery will support one full day of typical use, though some features like video recording are more battery intensive. Charging is through an included Micro USB cable and charger, and Google recommends the use of the charger that ships with Google Glass, rather than the "thousands of Micro USB chargers out there," according to a document on the Google Glass support page.
The device is compatible with Bluetooth-capable phones. The MyGlass companion app, which enables GPS (Global Positioning System) and SMS (Short Message Service) messaging, requires Android 4.0.3 or higher.
Google also gave a limited developer preview of Google Mirror API, which it told developersallows them to build Web-based services, called Glassware, that interact with Google Glass. It provides this functionality over a cloud-based API (application programming interface) and does not require running code on Glass, it added.
Timeline cards, which can be text, rich HTML, images, or video, are at the core of the user experience and display the content that users see, Google said. Developers can specify menu items on timeline cards and these can include built-in actions like read aloud, reply-by-voice, and navigation tools, or custom actions specific to the service the developer offers, according to the post.
Glassware can share content with contacts which can be a person or other Glassware. The Glassware can also be made aware of users' locations with appropriate permission from users.
Google has released user interface guidelines, a developer guide and reference documentation on the API for developers.
The terms of service for developers, however, prohibits them from charging users for downloading their client or from sale of virtual goods. Developers cannot also display advertisements through their Glassware clients, or use data from the client for advertising purposes. Developers are also forbidden from selling data collected through the application to third parties such as data brokers and ad networks.