Brand: Avantree. MPN: MELODY6018. Transmitter Bluetooth Version: 5.0 Audio Codec Support: aptX-LL aptX FS SBC Supported Profiles: A2DP AVRCP Operating Range: Class 1 100ft/30m Frequency Range: 2.402GHz-2.48GHz Product Size: 11.4 x 11.4 x 6.5 cm Net Weight: 145g Neckband In-ear headphone Bluetooth Version: 5.0 Audio Codec Support: FS SBC Supported Profiles: A2DP AVRCP HFP Operation range: Class 2 30 ft/10m Playtime: 20 hours Product size: 45cm Product weight: 53g.