1. LED Indicator Display: This wireless to wired telephone box features 9 practical LED indicators. These indicators clearly display signal strength and call status, allowing users to instantly assess connection quality at a glance. Whether making crucial business calls or conversations, the intuitive LED interface ensures stable communication by providing realtime signal feedback. 2. Slot Upgrade: The redesigned card slot offers notable improvements. Users can now effortlessly observe the alignment between the card and chip, simplifying phone card installation checks. For Catocompatible devices, card insertion and removal become exceptionally smooth. This upgrade streamlines card management, saving time and effort during operation. 3. Automatic StepDown Circuit: Equipped with an automatic voltage reduction circuit, this telephone box seamlessly integrates with 12V security alarm system power supplies. Eliminating the need for external adapters, it enables direct connection to alarm system power sources for immediate use. This feature enhances installation convenience and optimizes compatibility with existing security and communication setups. 4. Standard DTMF Input: A standout feature is its precision DTMF input recognition and display capability. Beyond standard caller ID functionality, it employs DTMF technology to prevent input errors like missed digits. During call operations, this ensures flawless number entry for reliable and error communication.