Electronic Specialists is now marketing an uninterruptable power supply The UPS is capable of supplying power for up to 20 minutes, and outputs a clean sine wave. The internal batteries are automatically kept at full charge.

Two models are available for power requirements of 250 or 500 Watts. Options include power line phase-lock, blackout illumination, and provision for an external battery.

For further information, contact Electronic Specialistst Inc., 171 South Main St., Natick MA 01760; (800)-225-4876. Reader Service number 152,

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