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The high-performance Doorbird D21DKV 423888203
It has as Kelvin-type alligator clips with copper contacts
# KC12-250
reverse polarity power protection and power protection module
the station features a concierge/security guard call button and an option button to control external devices
Sangoma EHS30 Wireless Headset Adapter, Part# PHON-ACCS-EHS30-SNG valcom VB-A21 The high-performance Doorbird D21DKV 423888203The efficient Sangoma PHON ACCS EHS30 SNG EHS30 Wireless Headset Adapter connects Sangoma IP phones to wireless headsets that have EHS (electronic hook switch) capability. The EHS Adapter connects between the Sagnoma phone and the wireless headset base unit. Features Allows the user to control off hook, talk, and on hook modes from the headset Supports popular wireless headsets such as Jabra, Plantronics, and Sennheiser Upgradable firmware for future
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