Yes, you can purchase any voice-enabled Sonos device and use it to control your Play:1s. If you use Amazon Alexa, you can even use an Amazon Echo device to control your Play:1s.

Thank you. does the alexa have to be in the same room as the Play 1

No. You can explicitly name the room you want music to play in with your voice request.  You can also setup Alexa groups so that an Amazon echo is tied to a Sonos room by default to play music.