These wireless Bluetooth sport headphones have 40mm speakers and a built-in microphone for music and calls, with TF card support.
Transmission distance: 10 m
Battery: 400mAh; playing time about 8-10 hours; standby about 120 hours; charging about 2 hours (USB)
Speaker diameter 40mm; sensitivity 105±3dB
Built-in microphone; TF card supported
Controls: short press the function key to switch songs or answer and hang up calls; long press for volume
Colors: silver, red, green, blue, black
Package includes: 1 Bluetooth headphone