Note: Manual measurement, please allow some errors. Specification: Item Type: Mini Recorder_x000D_Material: Zinc Alloy_x000D_Size: Approx. 4 x 2.7 x 1.2cm / 1.6 x 1.1 x 0.5in_x000D_Recording Format: WAV_x000D_Music Format: MP3, WMA, WAV_x000D_Built in Polymer Lithium Battery: 140mAh Features: 1[Through The Wall Performance] Mini recorder support dynamic recording, with through the wall performance, faster reception speed, there is sound that recording. 2[Noise Canceling] Small recorder is designed with noise canceling microphone to provide HD recording. Support voice activated, recording with sound, pause without sound. 3[With Time Stamp] Mini voice recorder built in time stamp, can accurately record the time, year, month, day, hour, minute and second are accurate, so that the recording has more legal effect. 4[Concealed Switch] The on off button of this small recorder adopts concealed push design to avoid accidentally touching the on off button, which will cause the recording off. 5[Durable And Portable] This pocket recorder is made of metal, wear resistant and drop resistant. Compact size design, more convenient to carry. PackageList: 1 x_x000D__x000D_MiniRecorder 1 x Charging Cable 1 x Instruction Manual 1 x Earphone