Electric pulse neck and back massager far-infrared heating analgesic tool for health care and relaxation. Size: medium Application: neck Material: ABS Item type: massage and relaxation Package size: 22.5X20X5CM Electric pulse frequency: 0-1000 Hz Electrical pulse width: 20-400 μs 1. Pulse frequency: 0 Hz-1000 Hz 2. Pulse width: 20us-400us 3. Power: 3VDC30mA 4. With 6 types of mode 5. With 16 types of strength 6. Main function: using electronic pulse massager to relax the neck 7. Power supply: 2 x AAA dry cells can use 7 hours continuously Transition: 1 cm = 10mm = 0.39 inches Please allow 1-3mm error due to manual measurement. Pls make sure you don't mind before bidding. Due to the difference between different monitors, the image may not reflect the actual color of the item. Thank you! Package: 1 x Neck massage device 2 x massage pads 1 x wire