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Power Consumption: approx. 7mA. *USE DC POWER SUPPLY ONLY! Failure to do so may damage the unit and void warranty. DC Power Supply Specifications: -9V DC regulated or unregulated, 100mA minimum; -2.1mm female plug, center negative (-). Optional factory power supply is available:Tech 21 Model #DC2. WARNINGS: * Attempting to repair unit is not recommended and may void warranty. * Missing or altered serial numbers automatically void warranty. For your own protection: be sure serial number labels on