You can run any number of belt pack receivers and headsets with the MEI100 in-ear wirless monitor system, so every member of the band can have their own.
Belt pack specification:
Specifications MEI 100 BPR Receiver
Article No.: LDMEI100BPR
Frequency range: 790,850 MHz to 813,800 MHz
Image rejection: > 60 dB
S/N ratio: > 95 dB
THD: < 1%
Audio output level: 100 mW ≅ 32 Ω
Audio response: 80 Hz to 18 kHz ± 3 dB
Dynamic range: > 90 dB, A-weighted
Dimensions: 95 mm x 65 mm x 25 mm
Weight: 0.57 kg
Power requirements: 2 AA batteries
Battery life: > 8 hours
(depending on battery type)