PetSafe Utrasonic Outdoor Bark Control Birdhouse. The box is open but the bark control is still sealed in plastic. Sold with free shipping.

Requires a 9-volt battery (not included), can be mounted or hung by wire hanger, on/off knob

Contains an internal microphone that identifies barking then emits an ultrasonic sound that can only be heard by dogs. The high-pitched sound should startle the dog and deter barking. 

Includes:

Outdoor bark control

Operating guide

Original box