This document describes a GSM voice recorder that features voice activation recording, a schedule mode, remote recording control by phone, long battery life of up to 400 days, waterproof and shock-resistant design, and small size suitable for surveillance, home security, or classroom recording. Key specs include support for up to a 32GB SD card, voice detection from 5 meters, and models with battery capacities from 5000mAh to 20000mAh for different recording durations.