Feature:Super mini size, easy to carry and hide.Very easy to use: just call the SIM number installed in the device. In just a few seconds you will hear a voice within a 10-meter radius.GSM Quad Band (8509001800, 1900Mhz) can work perfectly worldwide.Built-in 2-microphone to ensure good sound quality, outstanding sound quality makes spy more reliable.Supports preset number, phone number and mobile number, both are fine.Element type: Two-way audio deviceAcoustic alarm function is available.Long standby time: built-in 200mA buffer battery, with activated acoustic alarm function, it can last 3-5 days; It may take about 12-15 days if the acoustic alarm is deactivated.Materials: Molded plasticDimensions: 4.3 x 3.2 x 1.4 (cm)Power: Built-in 200mAh lithium-ion batteryColor: BlackVoice control on: 3-5 daysMain Function: Tri-Band GSM Two Way Audio Spying DeviceVoice control from: 12-15 daysWorking hours: 5 hoursMicrophone range: 5-7 meters radiusInclude package:1x bidirectional audio device1x USB cable1x User Guide (Chinese and English)Note:Color deviation may vary due to different monitor settingsWhen shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it