This two-way GSM audio device is designed for remote audio monitoring. Simply insert a GSM SIM card and program it to your preferred phone number to enable call-back functionality. The device can be placed in various locations such as a bedroom, living room, conference room, or office for convenient use. Key features: - Call the device remotely to listen in on surrounding audio. The built-in microphone supports a pickup range of up to 7 meters. - Auto-dialing function activates when sound is detected, calling your phone automatically. - Tri-band GSM compatibility (850MHz, 900MHz, 1800MHz, 1900MHz) ensures wide network support. - Built-in 400 mAh rechargeable lithium-ion battery provides extended operation. - Voice-activated mode offers continuous operation for 5–8 days. - Standby duration of 16–21 days when only using basic positioning functions. - Compact design with dimensions of 4.3 x 3.2 x 1.4 cm. Package includes: - 1 x Audio monitoring device - 1 x USB charging cable - 1 x User manual Device is made of molded plastic and comes in black. Intended for legal use only. Users are responsible for compliance with all applicable laws and regulations regarding import, possession, and use of audio monitoring equipment. This product is not intended for illegal surveillance or invasion of privacy. Check local laws before use.