Compact GSM wireless earpiece system for discreet, real-time phone calls. The small induction earpiece converts audio signals through electromagnetic induction and receives call audio from the GSM module, making it practical when exposing a headset is inconvenient. Key benefits Discreet and compact: Earpiece measures approx 12mm x 7mm and sits lightly in the ear for low visibility. Real-time connection: GSM module automatically connects incoming calls and transmits audio to the earpiece with minimal delay. Wide coverage where 2G is available: Uses GSM 2G cellular signal for stable voice transmission in areas that support GSM 900-1800 MHz. Clear, loud sound: Designed for clear speech reception in noisy or busy environments without overburdening the ear. Portable and ready to use: Built-in polymer battery in the module and included button batteries for the earpiece support extended use. Main features Miniature induction receiver for discreet audio reception using electromagnetic induction. Automatic call handling via compact GSM module that transmits call sound to the earpiece in real time. Stable signal and performance wherever GSM 2G coverage exists. Comfortable ABS construction and a small form factor for extended wear. Technical specifications Item type: GSM Wireless Earpiece Earpiece material: ABS Earpiece size: Approx 12mm x 7mm (0.47 x 0.27 in) Earpiece battery: 337 (SR416SW) 15mAh button battery x1 (two batteries included) Earpiece total working hours: About 6 hours Distance from A808 earpiece to GSM module: Approx 40cm (15.74 in) GSM module size: Approx 5 x 3.5 x 13 cm (1.96 x 1.37 x 5.11 in) GSM module battery: 650 mAh Li polymer battery built in Network band: GSM 2G full band (900-1800 MHz) Package contents 1 x GSM Module 1 x Earphone (A808 earpiece) 2 x Button battery (337 SR416SW) 1 x Earphone storage box 1 x Storage box Practical use scenarios Field work where a visible headset is impractical: receive and handle calls discreetly while on site. Security or event staffing: maintain clear communication in crowded or noisy settings without bulky equipment. Customer service or sales demonstrations: keep hands free and calls private when interacting with clients. Important notes Not applicable to the Americas. Verify that your country supports GSM 2G 900-1800 MHz before purchase. Allow slight measurement variation due to manual measurement. Product color may vary slightly from photos due to monitor differences; the actual item should be considered the standard.