Product description:

1. The signal source is generated by quartz crystal, and the frequency is extremely stable.
2. No contact, long service life, no damage due to long whistle time.
3. The sound quality is good, and it is not affected by vibration, low temperature, high temperature, humidity and voltage.
4. Multiple sounds, up to 22.
5. Keep the voice set by the user permanently without fear of power failure.
6. The installation operation is simple, and the single-wire control is used to convert all kinds of sounds, without additional accessories and any trouble of installation work.
7. Adapt to wide temperature environment,-40 degrees to +50 degrees.
8. Since the current of horn button is extremely small, there is no need to use horn relay to protect Speaker switch

9. Environmentally friendly green products with good sound quality and low electromagnetic radiation.

High-Tech patented products with microcomputer as the core, with contactless, good sound quality, stable frequency, long service life, various sounds, permanent memory setting, no fear of power failure, convenient installation, simple use, stable and reliable work, exquisite workmanship, various technical indicators conform to national standards and industry standards.