Bluetooth dongle:
1.bluetooth push to talk & bluetooth multi dongle
2.frequency:2402MHZ-2481MHZ
3.power supply:DC 5V

SPECIFICATION of BLUETOOTH PTT:

Version: bluetooth version 2.0compatible

Supported Profile: Serial

Talking time: Up to 7 hours

Standby time: Up to  200 hours

Charging time: Less than 2 hours

Dimension:41.5*40.5*13.5mm

Weight: 12.7g

SPECIFICATION OF BLUETOOTH MULTI DONGLE:

Version: Bluetooth Version 2.0 compatible

Supproted profile: Headset, Serial

Talking time: Up to 7 hours

Standby time: Up to 200 hours

Dimension: 44.9*29.4*10.8mm

Weight: 16.3g