Product Name: Shidu Top Rated Wireless Microphone with Receiver SD-U16 Model NO.: SD-U16 Output Impedance: 1000-20000? Wireless Technology: UHF Connector(s): USB Sound Field Force: Pressure Differential Type Transducer Principle: Electrodynamic Microphone Sound Channel: Stereo Signal Transmission: Wireless Style: Handheld Microphone Product Name: Shidu Wireless Microphone Model: SD-U16 Transmit Power Output: 13dBm Polymer Battery: 3.7V 380mAh Product Size: 66*32*26mm Net Weight: 50g UHF Frequency: 700-740MHz Direction Features: Unidirectional Function: Work with Any Speaker with Mic Function Frequency Response: 30-20000Hz Trademark: SHIDU Transport Package: 30PCS/CTN Specification: 66MM*32MM*26MM Origin: China HS Code: 85181000 Product Description SHIDU top rated wireless microphone with receiver SD-U16Specification:Model No.U16Direction:OmnidirectionOutput13dBmNet Weight50gUsed forspeaker; amplifier; comupterWireless distance30mInput voltage5V 500mAcraftsABS Material, UV coatingCharging time3~4 hoursconnectionUHFMusic playing time4~6 hoursAntennainsideFrequency response700~740mHzAvailable color:blackBattery capacity3.7V 380mAh polymer batteryAppearance size66*32*26mmWho we areAs the biggest manufacturer ofPortable Karaoke Speaker; Amplifier; Microphone; Bluetooth Speakerin China,SHIDUis a high-tech enterprise concerned withR&D, production, sales and service.Coveringanareaof3000squaremeters,wenowhaveover200 workers. Withmore than 50 professional experts with higheracademictitle and 5 world leading production lineswith 5S management, we have the production capacity of 20,000 sets per month.Strictly following theISO9000 quality control system standard, every product in SHIDU has been carved carefully.SHIDUownsmany technical patentswith designing, researching & developing and producing every product independently. Along the way, we always remember the initial determination.Certifications* SHIDU products all adopt ABS environmental protection material* SHIDU products have complete testing certificate* SHIDU goal is to let you share our advanced technology*Quality Goods, Value-based, Perfect, DreamFAQ1.Q:Why the voice amplifier with some noise ? A: Wear microphone correctly and decrease the volume can avoid noise effectively .2.Q:What is the charging time for battery ? A : Generally 4-5hours, temperature and other factors may change the charge time .3.Q :What is the lifespan for battery ,can i change the battery after the warranty ? A: about 1 years, please get in touch with us to change the battery .4.Q:Why sometimes the voice amplifier can't work ? A : 1)Please check the microphone is inserted into the right hole 2) if the battery is not used out 3)your voice amplifier is on ? Please contact us if you still can't solve the problem by yourself .5.Q:What is the lead time for stocks order , what is the lead time for OEM order ? A: 3-7days for stocks order , can mix color ,MOQ is 500pcs. 35 days for OEM order ,MOQ is 1000pcs .6.Q:What is your delivery time ? A: 1) OEM Oder: 25-35 working days 2) SHIDU brand inventory order: 3-5 working days