Evida V618 Digital Voice Recorder 5 stars. It is small (3-3/4"x1-3/16"x1/2") but can record in its 32GB upto 2324 hours of voice or 10,000 songs in mp3 or wav format. It can be voice activated at 6 different decibel levels.
It is great for recording lectures, meetings, and conversations or for recording music with high quality play back with head phones ... playback can be done also through the device' speakers. There is also a jack for an external microphone right next to the headphone jack.
Recordings can be transferred to a PC computer. The recording area is organized into different folders and navigation is fairly easy.
No batteries needed ... there is a rechargeable battery which is rated to record up to over 54 hours of recordings with full battery. Other very useful features: password protection, A-B repeat, auto record, bookmark which I use to practice my English pronunciation. It is perfect for this ... as it is to record music on it to listen to while working out. All this and at a reasonable price.