Specially developed for instruments- For active and passive pickup systems as well as acoustic piezos- 2.4 GHz digital technology- Unadulterated sound quality- 4 Operating channels: A, B, C, D- Power / Charge indicator- Rechargeable built-in battery (+2500 charges)- Latency: < 5 ms- Frequency range: 20 - 20000 Hz- Charging cable included