Commodity: Cervical Vertebra Pillow Model: HY-1010 Packing: color box Specifications: (ctn measurement) 58.5cm*61cm*38.5cm Power supply: 4.5V battery/outer collocate 9V power supply adapter Pulse intensity: < 1000 Hz Magnetic field intensity: 0.12T-0.18T Features: 1. Low frequency pulse electricity treatment 2. Relieve rheumatism pains of cervical vertebra 3. Particular hard and soft which double side design, improves your sleep