Important Note: When you connect headset or speaker,feel the sound like handsfree, please You have to Uncheck "Handsfree telephony" from the services setting on your bluetooth device -> Control Panel/Hardware and Sound/Devices and Printers -> select your device and right-click, open Properties, then go to Services tab and uncheck Handsfree Telephony. Marked as your default device in Control Panel -> Hardware and sound -> Change system sound -> Playback -> select bluetooth device and select set defaults. CRS V4.0 Dongle Support Bluetooth voice and date transmission Ultra-compact, easy carrying and space saving. Experience stereo audio with Advanced Audio Distribution Profile (A2DP) support. Bluetooth Low Energy (BLE) protocol support. Up to 3 Mbps data transfer rate with Enhanced Data Rate (EDR) support. Backward support classic Bluetooth V3.0/2.1/2.0/1.1 Bluetooth version: 4.0 with EDR - data transfer rate up to 3Mbps ISM Band: 2.402-2.480GHz Support Profile: Serial Port, Object Push, File Transfer, LAN Access, Personal Area Network, Audio Gateway Compatibility Windows 10, Windows 8, Windows 7, XP, Vista ,2003, 2000,Me, Bluetooth-enabled devices, like iPhone, iPad, iPod,Samsung Galaxy,note ,smart phones, tablets, keyboards, mice, speakers, printers, projectors,headsets & more Package including 4 x Bluetooth USB Adapter 4 x Driver installation CD PLEASE NOTE: 1. The product has the maximum range up to 35ft. 2. There is a misprint on the package showing that [Sending/Receiving range is 65-160 ft.]. We apologize for any confusion this may have caused.
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