SMS Audio STREET by 50 - Manual (Page 6)

Active Noise Control:
LED status:
Blue – ANC Power on, indicating that the active noise cancellation
function is turned on.
Red – Headphone under charging.
Green – Fully Charged.
None – ANC Power off, the headphone still can be used.
ANC switch:
It allows you to turn on/off the active noise cancellation control function.
note: up to 15db reduction in outside noises.
Battery:
Built–in lithium ion batteryallows user to listen to music for around
65-70 hrs with ANC on. Charging time for battery is only 2.5 hrs.
Active Noise Control