brand new and high quality Features: The appearance of the product is exquisite. Adopting cost-effective chip design. Built-in rechargeable battery, can work for a long for time. Both RX and TX can realize one-to-two function. The product status mode can be switched freely during work. RX, TX stereo design, better sound quality. LED status indicator design, product working mode is more clearly identified. The product connection is simple, without any cumbersome driving and downloading APP. Specifications: Bluetooth-compatible version Bluetooth-compatible V5.0 Support protocol RX: A2DP, AVRCP TX: A2DP Working frequency 2.402GHz -2.480GHz Power level Power level 2 (Class II) Coding RX: SBC, AAC TX: SBC One for two functions RX and TX modes are supported Working current RX26MA TX24MA Built-in battery 250MAH Charging time: about 2 hours Endurance for time 8H Bluetooth-compatible distance 10M (open place) Charging method Micro USB 5V/0.5A Input/output connection mode AUX (headphone) interface for system mobile phones and PAD, and Bluetooth-compatible speakers or earphones that support A2DP protocol to connect and use. Package includes: 1*3.5MM cable 1*Micro USB power supply line 1*Operation manual