Description: GSM Frequency: 900/1800/1900 MHZ.
Audio Amplification:-45dB.
Battery Life: 40 Hours.
Listening Time: 8 Hours
Calculator Fully Functional.
Fully Functional Desk Top Calculator Has GSM
Listening Device With 40 Hours Operation.
Battery charged with USB. This Fully
Functional Calculator can Be Left In Office
Without Any Suspicious And You Will Know What.