Ortega ODWS-1, Digital Wireless System, 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