Just like the Superior Sound GSM spy device but has better sound quality from the 4 built in microphones. Call from anywhere, you just insert your GSM sim, dial in after a few minutes & listen in. When you call the mobile number, this device will auto answer, it works like a phone with auto answer without a speaker. You can hear talking or whatever you are listening for when you call in to the sim card. Useful at home with the babysitter, teenager ect. No flashing lights or sounds when activated by your call
Works with standard GSM mobile frequencies 900, 1800
Built-in rechargeable lithium battery
Superior sound performance for price using 4 x Microphones, Receive sensitivity: -\+ 10K
Power Standby aprox upto  3 days Microphone range : upto 10 meters (radius)
For longer monitoring it can be connected by USB to a computer or Plugged in to mains power via an optional USB charger.
Dimensions : 6.2 x 4 x 1.5cm