Operating Instruction

VIII
．
Packing list :
1.SD251-BT Earphone headset 1pcs
2.USB charge cable 1pcs
3.Proudct user manual 1pcs
Product specification and parameters:
To prevent possible hearing damage, do not listen at high volume levels for long periods.
A warning that batteries (battery pack or batteries installed) shall not be exposed to excessive heat
Such as sunshine , fire or the like.
CAUTION
Product name
Bluetooth stereo earphone
Product model
SD251-BT/BT251-BK
Version
Bluetooth V5.0 (QCC3005)
Frequency range
2.402GHZ~2.480GHZ ISM Band
Wireless transmission
standard
CLASS 2
Channel
79channels of 1Mhz BW
Connection type
Point-to-point
Transmitting range
<=10M (free space)
Frequency response
20HZ-20KHZ
Signal to Noise Ratio
>82db
Audio power output
2X3mW
Status indication
Red and blue bi-color indicator light
Applicable pairing
product
USB Bluetooth adapter, Bluetooth mobile
phone, IPAD, MID, etc in accordance with HFP, HSP,
A2DP, AVRCP Bluetooth protocols
Support decoder
APTX/AAC/SBC
Battery
Polymer lithium-ion battery
3.7V 110mAH
Charging time
1 hour
Charging power supply
Computer USB 5V; Charger of output DC 5V
500mA
Operating time
About 4.5 hours ( Battery saturation state)
Standby time
More than 150 hours (
Battery saturation state)
Product size