Features: Dog Bark Control and Dog Training - Our anti-bark device provides a safe and effective solution for dog training and bark control. Suitable for All Size Dogs - The bark control emits super audible frequency sound at 20-24KHZ, the sound doesn't affect humans, but can grab the dog's attention. Convenient to Use Outdoor - The control range of the deterrent is 10 meters. No worry to carry it to the outdoor and hanging it on the tree. And The button on the surface of the product has a fluorescent effect, which is also convenient to carry out at night. Portable Size & Rechargeable - The device fits perfectly in your hand. With a chargeable lithium battery, take 2hrs charging time can work for 15 days and standby for 60 days. Tips for you - The anti-bark device doesn't effective in dogs with hearing problems, and we don't recommend using this product on dogs under 6 months and below 8 years old as it may disrupt the dog's development of hearing. Training is required to achieve highly effective and long-lasting use. Specification: Item Name: Anti-Barking Device Power: 3.7V 600mah Lithium Battery Charging Time: 2hrs Using Time: 15 Days Size: 10 x 3.7 cm Weight: 50g Package Weight: 95g Material: plastic colour: grey Package Contents: 1 x Anti-Barking Device 1 x Charging Cable (Due to different product batches, the appearance may be different, which does not affect use.) 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.