Parameter: Shell material: metal Weight: 93g Size: 78.5x39.7x18.4mm Recording format: WAV Battery capacity: 2800mA Recording bit rate: 192kbps Battery continuous working time: about 500 hours of recording, about 160 hours of headphone playback Function: recording while charging, built-in strong magnet; built-in deletion; built-in radio and F M recording function, one-key recording; built-in memory, support TF card expansion. Packing list: 1x Digital Voice Recorder 1x Headphone cable 1x Data cable 1x Instruction Note: 1.Please allow slight size deviations due to manual measurement,measuring methods and tools. 2.The picture may not reflect the actual color of the item because of different photographing light and display monitor.Thanks for your understanding. Compact recorder and fashionable luxury gift: The recorder has a compact body of 78.5*39.7*18.4mm, which can be easily put into a wallet, chest pocket/MP3, and can also be adsorbed on iron-containing items, with a wider range of application scenarios. Built-in 8GB memory + support 4-128GBTF expansion] The built-in 8GB memory can store large-capacity recording files to meet your recording needs, and supports TF card 4-128GB (not included) memory expansion, which can accommodate massive recording files and music files. DSP Intelligent Noise Reduction: Using the latest DSP intelligent noise reduction technology, it can automatically reduce ambient noise by more than 90%; coupled with our unique omnidirectional stereo microphone, it can capture farther/lower but clearer stereo HD sound. Superior Recording Quality: Clear recording with 1536 Kbps bit rate through two professional dynamic noise-cancelling microphones, different bit rate options, higher recording quality, multiple audio formats. It can also be used as a portable MP3 player. Voice-activated recording and long-distance recording] Support voice-activated recording, and automatically record when the sound appears. When no sound is detected, it stays in standby mode to save recording capacity and reduce power consumption. Recording distance up to 10 meters.