Wireless Motion Sensor Doorbell Automatic Door Bell MP3 Audio Player Welcome PIR Detector Alarm for Shop Store Visitor G

Features Pyroelectric infrared sensor induction AAA batteries or Micro USB power supply Have micro USB interface able to replace audio files through micro USB interface by USB cable on computer Power off memory function Built in 4Mbyte FLASH memory Built in 29mm 81 watt speaker MP3 audio format Specification Alarm YesDetector Infrared detector automatic inductionInduction range Less than 4m within 45 anglePower supply 3 batteries or USB power adapterFunction Audio downloadable from computer by USB cableMemory Built in 4M byte Flash memoryInstallation Ceiling mounted or wall mountedAudio format MP3 audio formatSample rate 44 1Khz 320Kbps Package Includes 1 x Wireless Motion Sensor Doorbell Details Pictures