AUTO RECHARGING AND MICRO SIZE Micro size telephone record with auto recharging faction, just connect to the telephone line, no additional power needed ^^ SUPPORT SD CARD FOR MEMORY STORAGE - Used for home/office telephone conversation recording, include 16GB memory card, support MAX 32GB micro SD card (not included) ^^ RELIABLE FOR RECORDING - Designed by Embedded lunix system with high speed MCU, make it running stable, not like the other telephone recorder need PC support, its only support analog telephone system ^^ PLUG & PLAY - Just connect the telephone cable to telephone line in / line out and turn the power switch to one side will start working, automatic recording each phone call