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Filter Nano X 40.5 mm XV38 K&F Concept YEELIGHT 5 hours Charging port of 5 hours Charging port of the case USB C Frequency 20 Hz 20 KHz Compatibility All devices that support the Bluetooth standard Dimensions of headphones 25 x 20 mm Dimensions of the case 43 x 30 x 43 mm 4 GHz) WiFi module Firmware ESP8266 (Possibility to upload alternative firmware Tasmota In addition and the clever design has avoided the X effect that occurs when the filter stages cross each other
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