AEC BQ618 Smart Wireless Bluetooth Stereo Handsfree Earphone with Microphone, Support 3.5mm for Phone Tablet PSPs Line Length: None With Microphone: Yes Wireless Type: bluetooth Name: AEC Connectors: None Waterproof: No Active Noise-Cancellation: Yes Support Memory Card: No Volume Control: Yes Frequency Response Range: 20-20000Hz Resistance: 25Ω Vocalism Principle: Hybrid technology Model Number: BQ-618 Sensitivity: 110±5dB Style: Headband Support APP: No Control Button: Yes Bluetooth Version: V4.1 and EDR Supported profiles: HFP, A2DP, AVRCP Support Apt-x: No Product parameters: Speaker specifications: 30mm Output power: 32 ohms 45mW Frequency response: 200Hz-2000Hz Sensitivity: 120db±3db Signal to noise ratio: ≥90DB Distortion: 0.5 percent Bluetooth standard: Bluetooth 4.1andEDR Supporting protocols: HFP, A2DP, AVRCP Support 3.5mm audio input Power supply mode: built-in lithium battery 190mAh Charging time: 3 hours (please extend the charging time for the first charge) Effective distance: 10 meters Working time: more than 10 hours Standby time: 250 hours Charging interface: Micro USB Built-in microphone to support digital signal processing echo cancellation technology Features: Smart Bluetooth, wireless HIFI Floating micro HIFI sound effect