Specifications Dimensions (WxHxD):121mm*39mm*16mm Voice Activated Recording:Yes External Microphone:Yes Balanced Out:Yes Package:Yes Model Number:HiFi Definitions Digital Voice Recorders Playback Formats:mp3,WAV With Speakers:Yes External Memory:Yes Record Audio Format:MP3,REC Origin:Mainland China Number of microphones:Two way mic Material of case:All metal capacity:8GB,16GB,32GB Noise Reduction Recorder:Digital Audio Recorder Product introduction Professional dynamic noise reduction of zinc alloy fuselage/PCM Automatic noise reduction 1536Kbps ultra-high fidelity acoustic recording Dual core dual channel, high-definition fidelity, timed recording LINE-IN recording, recording gain, telephone recording Recording low voltage automatic saving Support MP3 and WAV dual format recording Hifi Lossless Music 1.8TF color screen with built-in lithium battery and 8GB chip Two way mode recording single direction, omnidirectional Oversized loudspeaker brings you a shock feeling 2.0 High speed USB data connection without driver Dimension: 121 * 39 * 16mm Machine weight: 148g Standard package weight: 222.5g Full package weight: 264.5 Full package size: 195 * 110 * 35mm