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This set contains1 earpiece, 1 glasses, and 1 button cell battery.

Bluetooth 2.0 module is built in the left stand of glasses, so you should put the spy earpiece in your left ear, in order to get clear sound.

It pairs with Bluetooth phone in 10 meters of distance.
Pairing password: "0000". Bluetooth name: "T9"
It uses a small hidden button to control (pairing, on/off, redail, answer) .
Built-in rechargeable battery offer ~2.5 hours of working time and long standby time.
The Lens are transparent, anyone can use it for covert communication.
Built-in microphone for two way communication.

Earpiece Parameter:
Frequency Range: 200Hz~5400Hz
Distortion Rate: <2%
S/N Radio at 2KHz: >5KHz
Saturated Output(OSPL 90dB): 125dB
Ralative Sensitivity Limit: <-90dB
Static Current: 0.80mA
Battery Life (SR416SW battery):>3hrs
Diameter: 9mm