One button to power on / off, pair with Bluetooth devices Supports connecting with 2 Bluetooth devices simultaneously Bluetooth V4.2 wireless connection, the signal transmission speed is more stable and fasterA Processed Precise tuning, delivers high SNR low distortion signal, returns natural and original sound Standard 3.5mm audio port, compatible with a variety of earphones or headphones Original Xiaomi Wireless Bluetooth Audio Receiver Description Main Features: One button to power on / off, pair with Bluetooth devices Supports connecting with 2 Bluetooth devices simultaneously Bluetooth V4.2 wireless connection, the signal transmission speed is more stable and faster Processed Precise tuning, delivers high SNR low distortion signal, returns natural and original sound Built-in 97mAh Li-ion battery, lasts 4 - 5 hours playing time Metal clip-on design, footloose for doing sports Standard 3.5mm audio port, compatible with a variety of earphones or headphones Brand: Xiaomi Package weight: 0.054 kg Product size (L x W x H): 5.90 x 1.35 x 1.30 cm / 2.32 x 0.53 x 0.51 inches Package size (L x W x H): 10.70 x 8.00 x 3.10 cm / 4.21 x 3.15 x 1.22 inches