PetSafe - NanoBark Collar World's Smallest Bark Collar for Small & Medium Dogs

NanoBark is the next generation of bark collars bringing joy to households. Ultra-compact design prioritizes comfort reliability and durability. Learns dog's barking habits to detect and respond exclusively to your dog's bark. By learning vocal patterns NanoBark adjusts through 10 static stimulation levels. Rechargeable Lithium-ion battery provides up to 40 hours of use. Waterproof design is great for walks in the rain. Ideal for small to medium sized dogs - fits 13" necks or less.