GROOVYPETS Replacement/Spare Parts (Remote Controller or Receiver) for Remote Control Dog Training Shock Bark Collar Systems (BLACK BONE RECEIVER) Replacement/spare remote to work with GROOVYPETS AND MAGIC E COLLAR DOG TRAINING COLLAR SYSTEMS Fabric strap can be either blue or green color unless specified by customer Replacement /spare bone receiver either in black or white for Groovypets and Magic E collar remote dog training models USB charger charges two units at the same time, works with Groovypets and Aetertek dog trainers Assembly kit include prongs and plastic washers