365NM Purple Light Beads: Purple light intelligent constant current, accurate color temperature, can help you find , professionally adjusted color temperature, can detect skin abnormalities USB Rechargeable: Built-in battery, use a USB cable to connect the device to a laptop or a charger, one charge, normal use can be up to 30 days With Lanyard: Can be operated with one hand, equipped with a lanyard, easy to carry when going out, anti-lost, convenient for adults and children to use High Power: Small size, high power, easy to blow out candles with ultrasonic wave 25KHz. The filter is purer, the operability is , and the process is convenient Main Function: The ultrasonic waves emitted will stimulate the dog and surprise the dog, thereby interrupting barking and preventing uncivilized behavior, helping to train and develop good habits Type:Ultrasonic Dog Repeller Battery:Rechargeable Battery(built in) Colour:Gray-Black Material:Plastic Size:(LxW):About 106x24mm/4.17x0.94inch Package Contents: 1 x Ultrasonic Dog Repeller 1 x USB Cable 1 x Lanyard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.