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 . And The button on the 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 - 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.