Lentenda Auto Telephone Recording Box Telephone Recorder System Slot Digital Phone Voice Recorder Support 8GB SD Card This powerful recording device is very small, so it easily fits next to your phone Works only on single-line analog phone systems. Does not work on digital or internet phone lines, or multi-line phone The Telephone Recorder Pro is an easy-to-use stand-alone telephone recording system that automatically records your telephone conversations. Monitor personal and business calls, and keep recordings of every single call you make. Support with 8GB (max) memory card (card not included)