Green Lion Sound Flex 2 in 1 Headphones

Model: GL-HP51 | SKU: GN2N1SFHP

Specifications

Model No	GL-HP51
Material	ABS + Metal
Battery	1000mAh
Bluetooth	V5.3
Transmission Range	8-10 m
Speaker Driver	4Ω 3W
Impedance	32Ω
Sensitivity	115±3 dB
Frequency	20Hz-20kHz
Charging Port	USB-C
Charging Time	2-3 Hrs
Headphone Playtime	30-40 Hrs
Speaker Playtime	10 Hrs
Standby Time	100-200 Hrs
Product Weight	274 g
Product Dimensions	80 x 170 x 200 mm

Key Function Description

Power On: Push up to switch on; Push down to switch off.
Pair and Connect: When turned on, the headset automatically enters pairing mode. The indicator light flashes red and blue alternately ??. Turn on Bluetooth on your mobile phone, search for "GL-HP51", and connect. The indicator light turns off ✅ upon successful connection.
Music Function:
- Music playback: Click the play button.
- Next song: Long press the volume "+" ➕.
- Previous song: Long press the volume "-" ➖.
- Volume up: Click the volume "+" ➕.
- Volume down: Click the volume "-" ➖.
Call Function:
- Answer a call: Short press the play button.
- Reject call: Long press the play button.
- Hang up the call: Short press the play button.
Function Key:
- Single click: Play/pause music/answer or hang up calls ▶️⏸️.
- Double-click: Smart Callback ?.
- Three clicks: Switch internal/external audio ?.
- Four clicks: Bluetooth/Music switch (microSD/TIF) ?.
- Press 2 seconds: Call voice assistant ?️.
Wired Mode: Insert the 3.5mm audio cable to use the headset as wired headphones.
Charging: Connect the charging cable directly to the Type-C socket to charge.

Functions Overview

Basic Function

Function	Operate	Pilot Lamp	Cue Light
Power On	Push up to Switch on	Blue light on for one second ?	Power on
Power Off	Push down to switch off	Red light on for one second ?	Power Off
Pairing Mode	The headphones automatically enter pairing mode when turned on	Flashing red and blue lights alternately ??	Phone connected ?

Connection and Function Key

Function	Operate	Pilot Lamp	Cue Light
Automatic Reconnection Upon Startup	Automatically reconnect to the last connected Bluetooth device after startup	/	Phone Linked ?
Connect Back After Dropping Out of Range	When Bluetooth exceeds the working range, it will flash minutes. Automatic reconnection of 3 back to work within minutes, it will 3 if the reconnection time exceeds) the area (automatically shut down	/	The phone has been disconnected ❌
Connecting Two Devices Simultaneously	After the headset is successfully connected to the first device, Turn off the Bluetooth function of the first device, and the headset will automatically enter the pairing state. Turn on the Bluetooth function of the second device and search for the Bluetooth name of the headset. Select the Bluetooth name, click pairing, and the connection is successful. Open the first device and click the Bluetooth name to connect.	/	Phone Linked ?
Function Key	Single click: Play/pause music/answer/hang up calls ▶️⏸️. Double-click: Smart Callback ?. Three clicks: Switch internal/external audio ?. Four clicks: Bluetooth/Music switch (microSD/TIF) ?. Long press 2 seconds: Call voice assistant ?️.	/	blue light flashing slowly ?...

Charging Indicator

Function	Operate	Alert light	Alert light
Charging	It is recommended to use 5V=0.5A Charger and Type-C Charging Cable	Red light ?	/
Full Charge	The headset automatically stops charging when it is fully charged	blue light ?	/

Image: A woman wearing the Green Lion Sound Flex 2 in 1 headphones, smiling, with a bridge in the background.

Disposal

This product must not be disposed of as unsorted household waste. It is important to separate such waste for proper treatment and recycling, in compliance with local waste management regulations.

Warranty and Support

This Green Lion product comes with a 12-month warranty when purchased from Green Lion's website, official store, or approved sellers.

To extend the warranty, please visit https://www.greenlion.net/warranty and fill out the form with your product details. Make sure to upload a clear picture of the product. After review and approval, you will receive a confirmation email stating that your product's warranty has been extended.

For more information, please check: https://www.greenlion.net/warranty

Contact Us

For any questions, please contact Green Lion:

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