Call button is surrounded by luminous ring, new high quality design and metallic colored front cover, once exposed to light (min 30 minutes) this ring keeps emitting light for about 1 hour in the darkness, maximum residual lighting time about 1.5 hours, powered by phone system, no AC power necessary, can be surface or recessed mounted in most plastic single gang electrical boxes, compatible with KX-TDA, KX-TDE, KX-NCP, KX-TD, KX-TA, and KX-TAW phone systems, 4.5"W x 5.5"H x 1.5"D.
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