Binance ETH 2.0 staking question.

Binance ETH 2.0 staking question.

I have my ETH in Binance 2.0 staking and have received the equivalent in BETH. However I want to get my ETH out of that stake and store it elsewhere as I'm unhappy with the interest its earning. If I swap my BETH back to ETH and withdraw from Binance is it purely ETH? Or does it retain some BETH wrap? Sorry if this is a noob question I'm just worried about losing the ETH if I sent it to NEXO. Also, will I just lose the interest earnt to date by doing that? Thanks in advance