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From the development trend of audio products, the wire is an extremely important aspect sure to enjoy freedom of music. "Get gone the shackles of cable, using wireless method to enjoy music" could be the development direction of public expectations. In the current selection of wireless transmission protocol, 2.4G holdings are still high. Whalen's research pointed up some interesting facts which reveal parenting ADHD and just how stressful it truly is. She wished to learn the way a parent's stress levels changed in real time and the way these were directly associated with her child's behavior. She also got the youngsters inside the study who had ADHD to write down and record their perceptions of their behavior and also the parents' reaction to it. She had to make use of PDAs that have some built in reminder alarms to assist the youngsters try this.