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which BLE module to use?

Hi everybody!

I want transmit a few information (4 bytes) with Bluetooth Low Energy module every 700 ms. The module must match following specifications:

-very low power consumption;

-an 1.8 V supply;

-simple to connect with MSP430 (I've already have an Ez430-RF2500 dev. tool) or with a low power microcontroller powered by 1.8 V.

-very low price.

Thank you!