LCD Brightness Adjustable : Personalize your visual comfort with 5-level LCD brightness adjustment, making every call detail crystal clear. 16 Bit LCD Display : Our high-definition 16-bit LCD screen provides an immersive viewing experience, ideal for tracking important call data. Telecom Check & Caller ID Display : Perfect for troubleshooting and monitoring calls, this phone displays essential information for efficient call handling. DTMF Supported : Enhanced functionality through DTMF support ensures precise number transmission, critical for businesses relying on clear communication. Caller Number Record : Store and recall up to 57 groups of 8-digit or 36 groups of 16-digit caller numbers, keeping your contacts readily accessible. Revolutionize your telecom capabilities with our versatile Landline Test Phone, designed to meet the demands of today's fast-paced world.