Features: Unique and practical design, key backpack buckle recorder, can be easily put into your pocket or hung on the backpack, keys, convenient to carry and record important sounds in life. Voice-controlled recording, sound start recording, silent stop recording, save memory and electricity, efficient management. One-click recording save, boot recording, shutdown save, easy to operate. 8GB/16GB/32GB memory optional, can provide 96h / 192h / 384h recording capacity, support MP3 playback and recording playback. Built-in high-capacity polymer lithium battery, which can record continuously for about 25 hours and play continuously for about 15 hours. Specification: Model: S25 Material: Zinc Alloy Power Supply: DC 5V 1A Battery: 3.7V 120mAh Record Format: WAV Play Format: MP3/WAV/WMA Recording Bit Rate: 192KBPS Charge Time: 2 hours Record Time: 25 hours Play Time15 hours Save Time: 96/192/384 hours Memory: 8G,16G,32G(Optional) Color: Black Item Size: approx.7*3.5*0.8cm / 2.76*1.38*0.31in Package Size: approx. 14.5*9*4.5cm / 5.71*3.54*1.77in Package Weight: approx. 150g / 5.29oz Package List: 1 * Voice Recorder 1 * USB Cable 1 * 3.5mm Earphone 1 * User Manual