This Telephone Call Recorder Box is designed for telephone call recording, adopt wireless Bluetooth transmission technology, small and easy to use.You don't need to worry low memory problem don't need to operate something,compatible with Bluetooth connection to cellphone, then it can automatically record when a call comes in or dial it out. The recordings will be automatically stored to your cellphone. So you can manage the recordings on your cellphone. Don't need to worry about privacy.Application:Suitable for personal use. Businessmen, lawyer and other people who use telephones at home or at work and need call recording. Features: Auto record and auto answer telephone calls. No operations required when recording, easy to use. Compatible with Bluetooth connection to cellphone, recordings stored into cellphone automatically. Compatible with Bluetooth only needs to be connected once, automatically connected next time. No battery or charging required, no memory card needed. Used with APP, only for iOS version available. Don't need to open APP every time, only need to turn on Cellphone BT, automatically start APP to record. Suitable for personal use. Recording file name can be changed, m4a or wav format Specification: Working voltage: 4.2v Material: ABS. Recording current: 25mA Resting current: 10uA Port: RJ11 Environment: indoor use only, relative humidity less than 95 percent Product size: 6 x 6 x 2.8cm or 2.4 x 2.4 x 1.1in Packing list: 1 x Recording box 1 x Telephone line Note: This recording box can be used for only one telephone. If there are multiple telephone extensions on one telephone line, it will record all extension telephone calls. Currently only available for Apple phones. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.