Make your DD700 a multi-dog system Add-on or Replacement Collar/Receiver for the D.O.G. Director 700 (DD700). Available with your choice of Black, Orange, or Green collar straps. Black is recommended if you need to replace the original collar/receiver that came with your DD system. Orange and/or Green are recommended to expand your system to a 2-dog or 3-dog system. Features Lightweight Waterproof 10 levels of intensity, adjustable from the transmitter Nick and Continuous Stimulations MAXX-Range Internal Antenna System Rechargeable Li-Poly 2-3 hour quick-charge Available with Black, Orange or Green Strap WARNING: This product can expose you to chemicals including 1,3-butadiene which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov