The product is made of material, which is durable and lasting for use. Adhere to the number of episodes that can reduce fatigue, inhibit fatigue and discomfort, safe physical therapy, and no burden on safety. Use a head-mounted device to avoid drug dependence and side effects, and be economical and practical. Features - Color: Black. - Material: ABS+ elastic band. - Size: About 14.5 x 5 x 3.8 cm/5.71 x 1.97 x 1.5inch. - Input Voltage: 50 plusmn;02V180mA plusmn;30mA. - Charging Time: 1-2 hours. - Working Time: about 20 times 15 minutes/time. - Battery specification : 200mAh/3.7V. - Charging input interfacel: V8. - Adhere to the number of episodes that can reduce fatigue, inhibit fatigue and discomfort, safe physical therapy, and no burden on safety. - Use a head-mounted device to avoid drug dependence and side effects, and be economical and practical. - Helping you with insomnia relieves fatigue and stress to help you dream. - Using electric pulse to stimulate, improve the coffee secretion in the brain to block the transmission of pain nerves, can relieve stress, relieve fatigue and get rid of insomnia, and enjoy healthy life. - Good gift for your friends or families.