Mic Sensitivity: ~ 44 ?4 dB Output: 120 mW Plug: 3 PIN φ2.5mm Battery: Polymer Li-ion, 3.7V 110 mA (INPUT +6.0V, 0.3A) Recharging time: About 2 hours (Adaptor included), when full Red LED turn off Working Time: Up to about 3 hours continuous talking when fully recharged ON/OFF LED: Green LED ?power ON Compatibility: Compatible with most of the cordless phones and cell phones Users: Professionals, call centers, office workers, drivers and seniors etc. Warranty: Manufacturer Warranty 1 year Please contact for detailed information