Summit Electronics CSTW 428 User Manual

CSTW-428 Bluetooth Speaker Manual

1.On: long press ON buttons of two speakers, red led starts blinking; ON voice prompt heard,

speaker is waiting to connected to bluetooth.

2.TWS mode: long press PAUSE/PLAY/CALLING of any one of two speakers, then this
speaker is the chief speaker. The other speaker(vice speaker) will connect to the chief speaker
automatically, the led rim of the vice speaker will start to change automatically after connected to chief
speaker, the LED rim of chief speaker still blink which shows that it waits for the connection with
phone ; two speakers will connect automatically after turn on if paired once.
Note: get two speakers connect first, then turn on BLUETOOTH function on the phone to make sure
vice speaker can connect to chief speaker.

3.play: 1). Volume+: long press

2).Volume-: long press

3).forward: short press

4).backward: short press

5).play/pause: short press

6）answer phone call: press

7) reject phone call: press

4. LED mode: three modes, 1)change LED colors automatically,8 colors

2)change LED colors manually,8 colors

3)party mode

6.charging mode: after the third mode of LED mode, no LED light, red LED partly which is charging
light can be seen when charging; the red LED partly will go off when fully charged.

7.calling mode: only chief speaker can be used to phone calling.

8.specification：

Remarks

Bluetooth version
Battery voltage 3.7-4.2 V

V5.0

Nominal power 3W THD: 10%
Speaker Impedance 4Ω
Driver Size Φ45mm
Frequency Response 100Hz-20KHz
S/N ≥90DB

Play duration（maximum volume）

4hrs

Battery 1800mAh
Charge time 3hrs
Operation range(between speakers

10-15m
and phone)
Operation range(between speaker

10m
and speaker)

FCC Statement

Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:

-- Reorient or relocate the receiving antenna.

-- Increase the separation between the equipment and receiver.

-- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.

-- Consult the dealer or an experienced radio/TV technician for help
This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions
(1)this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.