My 11 year old son and I took a cheaper approach to this. Raidentech(I got lucky and had no problems) had some enexpensive spy cams ($29.00 per) that we got. Then on e-bay we got these video adapters that could plug into our laptops. The whole set up is such it fits into the carry bags for the laptops. Adhesive backed velcro and the cams and 9 volt batteries stay on the tanks. The cams have four different signal settings so no interference iisues on the two cams. Range is 75-100 ft. aslong as no major objects in between the cam and reciever. Loads of fun. If my work ever picks up my next goal would be to mount the cam in the tanks to get the multi view perspective mentioned.