works with:
Houndware HW601 Mini Rechargeable Remote Training Collar
Houndware HW01 Automatic & Manual Dog Bark Collar
Barktec BTU20 Handheld Ultrasonic Dog Training Anti-Bark Device
Barktec BTU10 Handheld Ultrasonic Dog Training Anti-Bark Device
Barktec BT-400 Ultimate Outdoor Ultrasonic Anti-bark Silencer