Sony has launched an SDK (software development kit) for its SmartEyeglass head-mounted display, another step toward challenging Google Glass.

The glasses can connect to Android smartphones via Bluetooth and project green monochrome text or basic graphics across a field within the lenses.

Sony said it will begin sales of the eyewear to developers by March 31, the end of its fiscal year. They will be sold in Japan, the U.S. and some European countries.

The Developer Preview SDK includes an emulator, tutorials, sample code and design guidelines to make the most of the device’s hardware and senors including an accelerometer, gyroscope and brightness sensor.

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