TRN-BT20S Pro Tru Wireless IEM Universal Adapters The BT20S Pro tru wireless IEM Adapters are designed to fit basically every standard IEM connection type available! To further improve how robust and easy the BT20S Pro adatpers are, you may purchase the removable ear hooks to fit a total of four standard IEM adapter types (listed below). This enables you to switch your cable connection type in seconds allowing you to switch effortlessly to any IEM you own. Equipped with Qualcomm's high-performance Bluetooth 5.0 chipset, the TRN BT20S Pro delivers a superb listening experience with an aptX High-Definition lossless transmission ACC/SBC High-Definition codec. Basically what that means is that the Bluetooth signal is better and more solid during movement and physical activity or at rest. Simply put, the TRN BT20S Pro tru wireless IEM adapters are the best value for the money. Available in MMCX, Two Pin 0.75mm or 0.78mm, and 2 Pin recessed connection types, we cover all removable cable IEM options. Additional Features: One-touch operation Nano waterproof coating Sweat and splash resistant Thermoplastic earhooks for flexibility APTX/AAC/SBC wireless high-definition HiFi transmission Customized FPC Bluetooth antenna DSP-enhanced noise reduction technology 80mAh Li-ion batteries for up to 9 hours of playback time Qualcomm QCC3020 high-performance chip Rechargeable storage case / charger with USB-C Tech Specs: Name: TRN BT20S Pro Bluetooth 5.0 Ear Hook Model: BT20S Pro Bluetooth Version: 5.0 Connection type: 2 PIN (C Pin)/MMCX/0.75mm/0.78mm Battery size: 80mAh Play time: About 9 hours Effective Distance: About 10m Charging Time: About 1.5 hours Charging Port: USB-C Volume Control: Yes With Microphone: Yes 2pin Sizes: 0.75MM/0.78MM/0.75MM C Pin Standard MMCX Adapter size