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Extra Loud 90dB Ringer with Flashing Indicator: Ensures you never miss a call, even in noisy environments like Workplaces, Garages, Individuals with Hearing Impairments, Schools and Residential Properties. Wireless Operation with 300m Range: Place the receiver up to 300 meters away from the transmitter for flexible installation. Expandable System: Supports up to four receivers per transmitter, providing broader coverage across multiple rooms or areas. Universal Compatibility: Works seamlessly with all phone types, including VoIP, SIP, IP, and analogue phones. Easy Plug & Play Setup: No technical skills required; simply connect and start using immediately.