• Can be used to build your own phone or kiosk using most standard parts
• Includes four screw terminals for spade tip handsets and 4-pin h/s connector for modular handsets
• Compatible with almost any 2-wire Hook switch unit
• Provides dual screw terminal or RJ11 connector for telco line connection
• Provides connectors for volume control & ringer
• PCB/Keypad for POTS lines and PBX extensions, analog
• Vandal and water resistant chrome key and buttons made of high-quality zinc alloy and conductive rubber made of natural, corrosion resistance silicone
• Used for inmate phones, kiosks and other applications
• All-in-one electronic dial features modular incoming line and handset connections for quick maintenance

Technical Specifications: 

• On-hook voltage-48V 
• Ringing voltage-90V 
• Call voltage-6-10V 
• Working current-20mA 
• Working Temperature--20~+40 F, -45～+65℃ 
• Contact resistance：≤100Ω 
• Life Span: ≥500,000 
• Waterproof Grade: IP65