Features: Transmitter mode: Wirelessly transfer audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers. Receiver mode: Wirelessly transfer audio from your BT-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. BT 5.0 technology has lower power consumption and more stable signal transmission. Receiver transmitter mode two in one, one key to switch. Suitable for audio equipment with 3.5mm audio interface and built-in rechargeable battery. PVC shell, strong and durable, small and exquisite appearance, easy to carry. Specifications: Model: BT13 Item Type: Transmitter Receiver Material: PVC Color: Black BT Version: V5.0 Battery capacity: 3.7V/200mAh Frequency range: 2.402GHz-2.480GHz SNR: 90dB Transmission distance: About 10m Item Size: 7.4 * 7.4 * 1.3cm / 2.9 * 2.9 * 0.5in Item Weight: 46g / 1.6oz Package Size: 16 * 9.5 * 2.5cm / 6.3 * 3.7 * 1.0in Package Weight: 93g / 3.3oz Package List: 1 * Transmitter Receiver 1 * USB Cable 1 * Audio Cable 1 * User Manual