• External microphone:Yes
• Dimensions (W):3.8 * 1.3 * 0.47in
• Audio recording format:WAV, MP3
• With Speakers:Yes
• Memory:8GB \ 16GB \ 32GB
• Battery:220mAh
• Recording Source:Telephone recording, Built-in MIC
• Product size:3.8 x 1.3 x 0.47 inche
• Recording Bit Rate:1536 Kbps
• Support System:Windows XP / 7 / Vista / 8 / IOS

Features: 
Memory: 8 GB / 16 GB / 32 GB 
Recording format: MP3, WMV 
Recording bit rate: 1536 Kbps 
Recording storage: high quality recording for 96 hours / normal recording for 136 hours 
Recording sources: recording from the phone, built-in microphone 
Battery: 220 mAh (can record for about 15 hours) 
Compatible systems: Windows 2000 / XP / 7 / Vista / 8 / iOS Product 
dimensions: 3.8 x 1.3 x 0.47 inches.