Sony MBH20 has average talk time of up to 8 hours. So, you can use it for almost 2 days talk time.
Sony MBH20 has 10 meters range.
Yes, You can use Sony MBH20 with Nokia 3310.
Yes, you can use Sony MBH20 with micromax mobile phone.
Yes, you can use Sony MBH20 with Gionee A1 easily.