??- Waterproof colloar、 small and light<br />- Viberation level can be adjusted.<br />- Nylon collar is easy to adjust and comfortable to wear<br />- Allowable bark level is adjustable.<br />- Small battery is easy to change.<br />- AG13/LR44 * 6 batteries included<br />                                                                                                                                Dimensions: 1.93 in x 1.14 in x 1.46 in<br />Weight: 4.25 oz