Specifications: This receiver supports connecting headphones, connecting mobile phones, speakers, and cars. It can be kept plugged into your car stereo at the same time charging in the USB port while in use. You can play, pause, skip music, answer phone calls, redial the last called number or control music on the receiver. and nbsp; Item Name: Audio Receiver Material: Plastic, Metal State Parameter:4.00V, Parameter:3.40V Operating Rated Voltage:4.00V, 3.40V Paired State Current: 4.33mA and nbsp;- and nbsp;m20.56mA, 4.47mA and nbsp;- and nbsp;22.03mA Standby Current (Bluetooth Connected): 0.43mA and nbsp;- and nbsp;8.31mA, 0.41mA and nbsp;- and nbsp;8.74mA Music Playback Current: 19.04mA and nbsp;- and nbsp;23.21mA, 22.85mA and nbsp;- and nbsp;23.74mA Call Current: and nbsp;23.82mA and nbsp;- and nbsp;24.05mA, and nbsp;25.19mA and nbsp;- and nbsp;25.78mA Charging Current: and nbsp;100.0mA Shutdown Current: 1.4uA, 1.1uA Features: Hands-free, Bluetooth, high clarity Call Size: 5.8cm x 1.5cm x 1.2cm/2.28 and quot; x 0.59 and quot; x 0.47 and quot; (Approx.) and nbsp; Instructions for Use: Power on and off: MFB long press for 3 seconds Volume up: Short press VOL + Volume down: Short press VOL- Switch language: Double-click and hold MFB in pairing state (red and blue lights flashing) and nbsp; Music Control: Play pause: Short press MFB Previous song: VOL-long press for 2 seconds Next song: VOL + long press for 2 seconds and nbsp; Telephone Control: Answer a call: Short press MFB when you call Rejected call: Long press MFB when calling Unnumbered redial: Double-click the MFB button, then short press MFB to cancel the dial out and nbsp; The LED Light Shows: Boot pairing: Red and blue lights flash alternately Connection status: Blue light flashes slowly (1 second in 5 seconds) Low voltage: Flashing red light (0.5 seconds 1 time) and nbsp; and nbsp; Notes: Due to the light and screen setting difference, the item and 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. and nbsp; Package Includes: 1 x Audio Receiver 1 x 3.5mm Metal Adapter 1 x USB Charging Cable Hands-free, Bluetooth, high clarity Call Plastic, Metal Audio Receiver Hands-free, Bluetooth, high clarity Call Plastic, Metal