Anti-barking device, Avomax, for all dog breeds, with canister ⚫︎ New, unused ⚫︎ Stored item ※ Built-in battery Approximately 7000 hours 8 hours a day The expiration date may have passed. ⚫︎ Includes one refill canister ※ One is included in the main unit package. ⚠️ The built-in battery may be dead, so I am offering it at a bargain price. ※ From previous sales, buyers have contacted me to say it worked fine. ⚠️ Please refrain from purchasing if you are overly concerned about details.