Features: 1.Small and compact, easy and portable to carry. 2.Easy to use, just plug in the phone card and power on. 3.Enhanced wireless signals for good performance. 4.Built?in 35db sensitivity microphone, support two ways intercom. 5.Concealed earphones are suitable for criminal investigation.Specification:Features: Small and compact, easy and portable to carry. Easy to use, just plug in the phone card and power on. Enhanced wireless signals for good performance. Concealed earphones are suitable for criminal investigation.Built-in 35db sensitivity microphone, support two ways intercom. Specification:Condition: Brand NewMaterial: ABS Color: YellowCard Size: 85 * 50 * 4.5mmBattery Capacity: 350mahDistance between GSM card signal and earphone: 40cm~60cm/15.7-23.6inTalk Time: 3~4 hoursHeadphone Battery Time: 6~7 hoursPackage Weight: Approx. 66g/2.3ozPackage List:1 * GSM Card1 * USB Charging Cable1 * 108B In-ear Headphones2 * 337A Button BatteryPackageList:1 * GSM Card1 * USB Charging Cable1 * 108B In-ear Headphones2 * 337A Button Battery