Mosquito repellent bracelet has outdoor, indoor, sleep three modes, to meet most of the user's scene needs. Transparent dial, can clearly see the gear state, can also highlight the sense of technology. The dial can be separated from the strap, and the dial has holes to hang a rope, which can be hung on the neck for children to carry out. The bracelet is a Type-C charging port, the red light indicates charging, and the green light indicates full charge. The best coverage range of the bracelet is 1 meter. Ultrasonic bracelet on the human body and cats and dogs is no harm, no radiation, please rest to use! Size:25.5x3.5x1.4cm Net weight:26.8g Charging interface:Type-C Rated voltage:5V Battery capacity:90mAh(polymer battery 3.7V) Sound frequency:34Hz-70KHz Charging time:About 30min Endurance: 5- Outdoor mode: 1 gear (fixed frequency :62Hz) Indoor mode: 2 gear (frequency conversion :34Hz, 50Hz, 154Hz) Sleep mode: 3 gear (automatic sweep frequency :18.8KHz-70KHz) Color:A:Black Material:plastic Package Contents: 1 * Mosquito repellent bracelet 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.