This UK style double adapter type plug has a professional high quality GSM Engine fitted inside with a high sensitivity knowles microphne and internal noise filtering circuitry. To operate this unit, you fit a normal mobile phone SIM card inside and plug the adapter into any mains wall socket. You then dial the number of the fitted SIM card from any phone in the world, the device will automatically answer the call and enable you to listen in to the room conversation
It is for GSM 900/1800 Mhz
you can order is from China Electronic Wholesale
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