Secure your device on back of headrest for viewing backseat viewing with this Ansteker Auto Headrest Phone or Tablet Holder. Adjustable height and width. Goes from 4 to 7 inches in height and 3 to 5 inches in width to hold your device. Ideal for mounting phones or tablets Ensures secure hold during car rides Suitable for backseat viewing during long trips or if car camping. Size: Goes from 4 to 7 inches in height and 3 to 5 inches in width to hold your device.