The Case of Remax TWS-43 Wireless Earbuds can be used as an emergency power bank when your phone is in need of charging. The charging capacity is 1200mAh. There is also a digital display on the case which displays the battery of the case. 200 hours standby time and 6 hours playtime. 
Model:
TWS-43
Name:
Wireless Earbuds with Digital Display
Bluetooth version:
5.0
Support protocol:
A2DP / HFP / HSP / AVRCP
 / SPP
Transmission distance:
10m
Speaker driver unit:
8mm
Rated power:
0.3 watt
Frequency response:
20Hz - 20kHz
Impedance:
32Ω
Standby time:
200 hours
Play-time:
6 hours
Charging time:
2 hours
Earbud battery capacity:
45 mAh
Charging case battery capacity:
1200 mAh
Waterproof rating:
IPX4