... 5.Long standby time Solar 2-way GSM Audio Device,Audio Device,GSM audio listening device,GSM SIM audio device,This product is using ... external software or configuration, just insert a valid SIM card into the SIM card slot, placing it at a inconspicuous location ... : 50mm x 40mm x 15mmSIM Card slots - work with all GSM SIM cardEmbed condense microphone.Microphone range: about 20 Meters (diameter)Receive ...