2 pcs Leg Knee Support Pillow Car Seat Headrest Vertical frequency range: 50 /

Vertical frequency range: 50 / 60Hz

so it can maintain about 6-8 hours of working time after a full charge

and you need to unplug it to use it

and is carefully stitched with a strong stereoscopic sense

which is safer

2 pcs Leg Knee Support Pillow Car Seat Headrest Vertical frequency range: 50 /Description: Supports Your Legs And Knees: Our knee pillow for side sleepers is longer than traditional leg pillows to offer support for both the legs and knees while you sleep to help reduce pressure and keep them aligned while making sure you stay comfortable. High Density Memory Foam: We made our orthopedic memory foam pillow using soft and breathable memory foam that offers just the right balance of softness, durability, and resilience. It