Nux B-7PSM - Digital 5. 8 GHz wireless in-ear monitor system, easy and uncomplicated plug-and-play application, compact body pack can be attached to the belt or strap of the instrument, frequency range: 20 Hz - 19 kHz, sample rate: 24bit/ 40 kHz, battery life: 4 hours, charging time: approx. 1.5 hours, latency: