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Wireless microphones can be good for singing, especially if you need the freedom to move around on stage or away from a PA system. They do have limitations compared to wired mics, such as a shorter battery life and potential interference. Also, the overall sound quality might not be as clear and crisp as some wired mics. Nevertheless, they offer flexibility for performers and are definitely suitable for singing.

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To have a nice voice, consider the following tips:

1. Hydrate: Drink plenty of water to keep your throat and vocal cords lubricated. This can help to improve the quality of your voice.

2. Warm Up: Before speaking or singing, warm up your voice by doing some simple exercises, such as humming or sliding between notes on the Virginal Scale.

3. Practice Good Posture: Stand up straight and tall with your shoulders back. Good posture can help you to breathe properly and speak with more confidence and clarity.

4. Relax: Try to relax and release any tension in your neck, jaw, and shoulders. This can help to improve the tone and smoothness of your voice.

5. Breathe deeply: Take slow, deep breaths from your diaphragm rather than your chest. This can help to improve your breath control and support your voice.