Detailed Product Description

A comprehensive surveillance transmitter monitoring both room and telephone conversations: telephone calls are transmitted whenever the telephone is in use and room conversations at all other times. Parallel connection to the telephone line restores charge to the internal battery whenever the telephone is not in use. ES74 FEATURES: Internal or external Mic.(specify when ordering) Internal or external antenna (both provided) SPECIFICATIONS FREQUENCY RANGE: 350-960MHz FREQUENCY STABILITY: +/-5ppm MODULATION: narrowband FM MICROPHONE: internal or external electret DEVIATION: 4kHz ANTENNA: internal or external plug-in flexible cable POWER REQUIREMENT: parasitic from telephone line (charging internal battery) CONNECTION: in parallel OPERATING TEMPERATURE: -10 to 65C SIZE: 40 x 33 x 17mm