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The ES74 is a telephone monitoring device when the telephone is in use and a room transmitter at all other times. The unit is powered by its own internal rechargeable batteries SPECIFICATIONS - ES74 FREQUENCY RANGE 135-220MHz (VHF) 350-960MHz (UHF) POWER OUTPUT 25mW FREQUENCY STABILITY .005% of assigned channel MODULATION Narrowband FM ANTENNA Flexible cable MICROPHONE External electret POWER REQUIREMENTS Internal rechargeable 3.6V SIZE 60 x 35 x 20mm FEATURES On/off switch RECOMMENDED RECEIVER - ERP2 
SALE CONDITIONS FOR TRANSMITTING PRODUCTS Note - The use of transmitter equipment is prohibited in some countries. It is the responsibility of the customer to ensure that they have the legal right to import these products before purchasing through us. Upon purchasing, the customer becomes wholly liable for any legal issues that may occur as a result of the importation and/or use of these products in the destination country.
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