A brush for a voice prosthesis containing a reduced diameter hard cartridge disposed in the distal section of a soft outer body. As the device monitors a change in the light condition within which the device is being utilized, a process will modify whether the backlight will turn on or off and what value of contrast will be used. The user equipment receives an uplink triggering grant from a base station, with the uplink triggering grant specifying a measurement subframe for which channel state information is to be reported. The second roll assembly has formed therein a number of annular grooves spaced axially of the second roll assembly at an interval of 50 mm or less and each having a width of 10 mm or less, thereby having a number of sectional elastic portions which are separated by any two adjacent annular grooves and each of such elastic portions being deformable independently of other similar portions.