MaterialABSFrequency 4000rmin frequencyStroke: 12mmPower supply: rechargeable lithium batteryRated voltage: AC110-220V, 50/60HzBattery capacity: 2400mAhBattery rated voltage: DC 16.8VWorking time: 4-6 hours massagerCharging time: 2 hoursPackaging Details:1 * 2400mAh Massage Gun6 * Massage head1 * Li-ion battery1 * Charger1 * English user manual1*bagDear Sir and Graceful Lady: I'm glad you can come to my store, it's an honor to have you. I hope the products in my store can satisfy you. If you need, you can send an email to ask, I will be happy to answer it for you. If you don't understand anything about the product, please give me a chance to answer your questions. I hope you have a great time shopping in my store! ! ! The world is so big with so many landscapes. Hope you can enjoy the beautiful scenery more! I wish you a happy life, happy every day!