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Compatible Bluetooth Specification V2.0. Class2. 
Operating Frequency Band: 2.4GHz ~ 2.48GHz. 
Support Multiple paired. (2 Bluetooth Phones can be paired meanwhile). 
Integrated with echo cancellation and Noise suppressor. 
One-Touch Answer, Call Rejection, Last Number Redial. 
Advanced built-in louder speaker and microphone. 
Battery type: AAA dry battery. 3pcs needed. 
Bluetooth version: 2.1 
Operation distance: max 10m 
Bluetooth frequency:2.4GHz 
Input voltage: DC 12V-24V 
Operationg temperature:-20 ?—+70 ? 
Battery volume:800mA 
Standby time: one month 
Talking time: one week