Amazon.com: Synergy Digital Dog Collar Batteries, Compatible with Dogtra 2000 Training & Beeper Dog Collar, (Ni-MH, 4.8V, 400 mAh), Replacement for GP 28AAAM4SMX, Battery, Combo-Pack Includes: 4 x DC-1 Batteries : Electronics
Amazon.com: Synergy Digital Dog Collar Batteries, Works with SportDOG SDR-BEEP Add-A Dog Beeper Dog Collar, Combo-Pack Includes: 3 x Lith-8 PANA Batteries : Electronics
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Amazon.com: Synergy Digital Dog Collar Batteries, Works with Dogtra 2002 Beeper Receiver Dog Collar, Combo-Pack Includes: 5 x DC-1 Batteries : Electronics