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4Pcs Sports Neckband Headphones Neck Hanging Wireless Bluetooth Earphones with Transmitter B10 Features: Soft silicone material, smooth curved design, comfortable to wear 30 meters ultra long transmission distance with strong penetration Type-C interface for fast charging, up to 20 hours standby time Built-in 400mAh lithium battery with low-power technology for long-lasting battery life The wireless transmitter adopts a 3.5mm interface and can connect to 99.9% of the sound cards on the market Cool atmosphere light, freely switching, suitable for different scenes 2.4G+Bluetooth 5.2 dual chip, simple and fast connection, stable signal Specifications: Material: PC+ABS Standby time: about 20 hours Battery capacity: 400mAh Charging time: 2-3 hours Bluetooth version: 5.2 Frequency range: 2.4GHz -2.48GHz Bluetooth receiving distance: 10 meters Package Included: 4 x Bluetooth Earphones (Receiver) 1 x Transmitter 1 x Type-C to 3.5mm Audio Cable 1 x Charging Cable 1 x User Manual