The RockJam Wireless microphone has been expertly-engineered for true high-fidelity sound, making it perfect for home concerts or fun evenings with friends. It’s 6.35mm wireless receiver makes it compatible with most audio equipment without the need for wires with 6-8 hours battery life. Dynamic microphone making it ideal for on-stage use. 6.35mm jack connection . Suitable for Universal. Suitable for Karaoke, PAs and Amplifiers. Manufacturer’s 1 year guarantee. EAN: 5025087001455.