Features: 1.Interface type: 3.5mm. Bluetooth version: Bluetooth 4.1. Battery : 80mah rechargeable lithium battery. support 2 in 1, support to connect earphones. mobile phones, speakers, cars. Bluetooth receiver, Car Bluetooth receiver, AUTO Bluetooth. receiver, AUX Bluetooth receiver, audio adapter. 2.Basic functions: Telegraphic number: Support. Voice prompt: Support. Chinese?english dual voice: Support. (Default English) 2 in 1: support. Pairing timeout shutdown: The pairing state lasts for 5 minutes before shutdown. Low power reminder: when the voltage is less than 3.2V, remind once every 5 seconds, 3.1V shutdown. 3.System status: Power on and off: Long press the power on button for 5 seconds. Volume up: press +. Volume down: short press ?. 4.Music control: Play pause: Short press the power button. Previous song: ‑ Long press 2‑3 seconds. Next song: + long press 2‑3 seconds. 5.Telephone control: Answer the phone: Short press the power button when calling. Reject calls: Press the power button for the duration of the call. No redial: Double click the power button, then press the power button to cancel the redial. 6.Led light display: Power‑on pairing: red and blue lights flash alternately. Connection status: blue light flashing slowly. Low voltage: red light flashing. 7.Working current: State parameter (4.00V). Rated voltage 4.00V 3.40V. Paired state current 4.33 mA?20.56 mA 4.47 mA?22.03 mA. Standby current (Bluetooth connected) 0.43 mA?8.31 mA 0.41 mA?8.74 mA. Music current 19.04mA?23.21mA. 22.85mA?23.74mA. Call current 23.82mA?24.05mA 25.19mA?25.78mA. Charging current 100.0mA. 100.0mA. Shutdown current 1.4uA 1.1uA. specification:Condition: 100% Brand New Item Type: Bluetooth Audio Receiver Material: ABS Colour: Black Weight: Approx. 25g/0.9oz Battery Type: Polymer Lithium Battery Battery Capacity: 180MAH Bluetooth Version: V4.1 Stand-by Time: about 250h Call Duration: about 10h Battery Status: Support for Android,for IOS Frequency: 2.4Hz Support Agreement: HEP1 / 6 / A2DP / AVRCP Connection Distance:15m/49.2ft Main Function: No Flashing Lights, to Telegraph Number, Intelligent Noise Reduction, Chinese and English Voice, Low Power Reminder PackageList:1x BluetoothAdapter1x 3.5mm/0.1in Audio Head1x USB Cable1x Instruction