HF wireless technology: HF wireless technology, stable system, long wireless reception range. The open distance is more than 200 meters. Waterproof: Call buttons use advanced micro-processing chip, making its performance stable, reliable and waterproof. ABS Material: The wireless pager button is made of sturdy ABS material shell, wear-resistant and durable, suitable for increasing the working frequency of the 433.92MHz broadcasting host display. Easy to use, you just need to set up the machine first, press the button of the transmitter, the receiver can receive the reminder Wide range of applications: Widely used in homes, hotels, bars, restaurants, factories, workshops, restaurants, clubs, bowling alleys, massage rooms, churches, country clubs, gyms and offices and other places.