The KVP Bird E-Collar is a must-have for any bird lover. This e-collar features a padded neck and an adjustable collar that can be adjusted to fit most birds. The e-collar also has a rechargeable battery that lasts up to 6 months. The KVP Bird E-Collar is available in two sizes: 2. 75-3. 5″/6″ and 3. 35-4. 9″/10″.