This item is a dual use transmitter and receiver. It is suitable for your car, home, or portable audio device with capability to wirelessly stream music from your smartphone, tablet or computer. Instantly upgrade your favorite speaker by connecting it through its AUX line-in port, or even add to your favorite pair of headphones with the included 3.5mm audio cable. Feature - It is able to change the traditional speakers into -enabled ones. - Built-in 300mAh Battery ensures up to 7 hours working time, you can enjoy wireless free all day long. - Advanced noise suppression and echo cancellation technology offers you wonderful sound quality. - There is no need to download any app to pair your device. - Compatible with almost all audio device on the market. Specification - Color: Black - Material: ABS - Size: 11.2x5.7x2.2cm/4.4x2.2x0.87inch (L x W x H) - Working Frequency: 2480MHz - Transmission Rate: 3M/s - Version: 3.0 and EDR - Support Protoclo: A2DP and AVRCP - Working Range: about 10M/33feet - Working Time: TX Mode: about 7h; RX Mode: about 7h - Standby Time: about 400h - Charging Time: about 2h - Input Power: DC 5V - Battey Type: Built-in Rechargable Li Battery - Battery Capacity: 300mAh