Mini Telephone Audio Voice Recorder with 16gb Memory, SD Landline Telephone Voice Recorder for Home & Office Analog Telephone System Built for home/office telephone conversation recording,built in 16gb memory support for 200 hours voice recording Worldwide smallest size with plugin to start working function,easy to place on your home/office. Designed by Embedded lunix system with high speed MCU,make it running stable,not like the other telephone recorder need PC support. Just plug the telephone cable to line in/line out and connect power adapter to start working,automatic recording each phone calls. Low power consumption,only working with analog line telephone,do not support digtal line telephone