This is rechargeable audio-detection spy voice recorder is of great use. It can be used as a normal ballpoint pen while recording and nobody will recognize this is a recording pen. This recorder pen can be used to record meetings conversations and lectures. It is a good convenient and useful recorder pen for you. - Tiny voice recorder hidden inside a working pen - Voice format: WAV - Features audio detection function: auto start recoding when the sound reach 60dB - Support TF card up to 16GB - Built-in 220mAh lithium battery recharged by the any powered USB port - Package included: - 1 * Spy voice recorder pen - 1 * USB charging cable - 1 * English/Chinese user manual