The permission read contacts is used for detect missed call. You can check the source code on my github to make sure this app don't read/send your contacts data.
NSTools need superuser (a.k.a root) and also custom kernel with Ezekeel's ...Read more
Allows an application to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the application to slow down overall performance of the phone by constantly running.
prevent phone from sleeping
Allows an application to prevent the phone from going to sleep.
YOUR PERSONAL INFORMATION
read contact data
Allows an application to read all of the contact (address) data stored on your phone. Malicious applications can use this to send your data to other people.