ESSAGER ES-BT09 Multifunctional Bluetooth-compatible Adapter Portable wired To Wireless BT5.3 Lavalier Converter Support Mic WiredtoWireless Reuse Idle Devices: Through the 3.5mm interface,wired devices add Bluetooth-compatible functionality. No longer bound by cables,Enjoy wireless freedom Voice Navigation Focus On Driving: Connect to car audio equipment with AUX interface and increase the volume,Navigation voice guidance will not let you miss every intersection Take Selfies Without Restraint: Via Bluetooth,Just one click,Get rid of distance restrictions and multiple angles at your fingertips. Make photography flexible and diversified Built-in Microphone 3D Stereo Surround: Bluetooth-compatible 5.3 audio decoding + HD noise reduction microphone + 3D surround sound,the vocal details during calls are richer Far & Near,All Stable: Supports 10-20 meters transmission,Stable signal,Let you easily get rid of the headphone length limitation Features: Bluetooth/TF dual mode,lavalier design,Bluetooth-compatible photo,Bluetooth-compatible 5.3,built-in microphone,built-in 110mAh polymer battery,suitable for multiple devices Specifications: Material: ABS Output Connector: 3.5mm Bluetooth-compatible version: 5.3 Bluetooth-compatible protocol: A2DP/AVDTP/AVRCP/RFCOMM/HFP/HSP/SPP/HID Signal-to-noise ratio: >90dB MIC sensitivity: ±42dB Frequency Response: 20Hz-20kHz Transmission distance: 20m Output power: 11mW RL=16Ω Battery Capacity: 110mAh Charging time: 2 hours Using time: 4-5 hours Product size: 56.5 23 x 7mm Weight: 30g Package included: 1 x Bluetooth-compatible Adapter 1 x Charging Cable 1 x 3.5mm Audio Adaptor Other items not included