Features: 1. Strong magnetic adsorption is easy to obtain evidence. 2. Professional recorders obtain evidence. 3. The appearance is the same as mobile power, and can't be found when measuring marriage, love, evidence, etc. 4. Small and easy to hide long recording time. 5. Automatic encryption to protect privacy. Parameters: Model: Q73 Colour: Black Product Name: Strong magnetic recording pen Battery: environmentally friendly polymer lithium battery Charging time: about 5 hours Recording time: about 500 hours Recording mode: start recording, save off Recording format: WAV Play format: WAV/WMA/MP3 Sampling rate: 48KHZ Signal to noise ratio: 90dB Frequency response: 20~20000Hz Memory: 8/16/32GB Recording time: 15 days Audio format: MP3, WAV Compatible systems: Windows, MAC, Linu Additional features: clock, recording, telephone recording Power battery: built-in high quality lithium battery 8GB recording file storage 96 hours Sampling rate: 48KHZ speed: 192Kbps Recording bit rate: 192KBPS Product size: about 20.5x26x71mm Product weight: about 135 grams