They have always included a photo cell as I recall but it is not an expensive part if you need a new one. It just plugs in, they cost about $15. The 7095 has a different photocell that is hardwired. The Wavebox must have the 6091, no other controller can run it. The photocell just turns it off at night which may not even be an option you want.
With just one magnet holder the wavebox rocks with the wave and will literally walk across the aquarium.