Skin-friendly material:PU Leather,Massage Principles:Vibration, Air Pressure,Power supply mode:USB Plug-in,Color:10S-B Heat Therapy, 10S-A2 Heat Therapy + Massage, 10S-C White Heat Therapy + Massage + Bluetooth Music, 10S-C Pink Heat Therapy + Massage + Bluetooth Music, 10S-C Black Heat Therapy + Massage + Bluetooth Music, 4S Classic Heat Therapy + Air Pressure Massage, 5S Upgraded Heat Therapy + Air Pressure Massage + Bluetooth Music, 6S White Flagship Bluetooth Music + 2 Levels of Heat Therapy + 2 Levels of Massage, 6S Black Flagship Bluetooth Music + 2 Levels of Heat Therapy + 2 Levels of Massage, 8S White Luxury Model 5 Massage Modes + Eye Heat Therapy + 9D Airbag Massage + Multi-frequency Vibration + Bluetooth Music, 8S Pink Luxury Model 5 Massage Modes + Eye Heat Therapy + 9D Airbag Massage + Multi-frequency Vibration + Bluetooth Music, 8S White AI Voice Control Model 5 Massage Modes + Eye Heat Therapy + 9D Airbag Massage + Multi-frequency Vibration + Bluetooth Music, 9S WhiteAI Voice Control Model with 5 Massage Modes + Eye Heat Therapy + 9D Airbag Massage + Multi-frequency Vibration + Bluetooth Music, 9S Pink AI Voice Control Model with 5 Massage Modes + Eye Heat Therapy + 9D Airbag Massage + Multi-frequency Vibration + Bluetooth Music,Brand:Little Wei Mi,Functionality:Music, Folding, Heating,AI Intelligent Voice:Support AI language function,Exterior Craftsmanship:Spray UV paint, rubber paint, metallic paint, piano lacquer, pearlescent powder,Battery life duration:1-3 hours included,Built-in Battery Capacity:50mAh-100mAh included,Applicable to the target audience:adult,Does it have a built-in battery?:Built-in battery