Purchase Instructions: This product is available with or without a battery. If it comes with a battery, it will be delivered with a power bank; if it doesn't come with a battery, you'll need to provide your own power bank or use it via USB.The massage vibration sound can be a bit loud, but not excessively loud. If you mind the noise, please do not purchase.Thank you Factory Direct Supply We are a company specializing in electronic health products with 20 years of experience Welcome all major merchants to inquire and collaborate