Function: Anti barking training aid for dogs using ultrasonic sound and sound-only modes. Battery life: Sound mode duration 15 hours, ultrasonic fixed-frequency mode 1.5 hours, ultrasonic variable-frequency mode 1.7 hours, flashlight plus ultrasonic fixed-frequency mode 1.3 hours, flashlight plus ultrasonic variable-frequency mode 1.5 hours, LED flashlight mode 28–30 hours.
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