boAt Airdopes 155 True Wireless Earbuds vs boAt Airdopes 138 True Wireless Earbuds

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General

Bluetooth	Yes, 5.3	Yes, 5.0
Bluetooth Range	10 m	10 m
USB	Yes	Yes
Microphone	Yes, Quad Mic with ENC	Yes
Voice Assistant	Yes, Hey Siri & OK Google	Yes
Water Resistant	Yes
Monaural	Yes
Controls	Touch
Music Controls	Pause/Play
Call Controls	Accept/Reject calls
Switch between Call and Music	Yes	Yes
Additional Features	IPX4 Rated, Low Latency BEAST Mode, Type-C Fast Charging, LED Indicator	LED Battery Indicator, Type-C Charging Port, Insta wake N' Pair

Deep Bass	Yes	Yes
Sensitivity		90dB
Frequency Response	20 Hz (Min) - 20 kHz (Max)	20 Hz (Min) - 20 kHz (Max)
Driver Unit		13 mm
Driver Type	Dynamic	Dynamic
Environmental Noise Cancellation	Yes
Other Features	boAt signature sound

Sales Package

1 Pair of Earbuds, Charging Case, Charging Cable, Warranty Card, Additional Earbuds, ‎User Manual

1 Unit Pair of Earbuds, 1 Unit Case, 1 Unit Cable, 1 Unit User Manual, 1 Unit Warranty Card, 1 Unit Catalogue, 1 Unit FAQ Card

Power Input	DC5C/1A	5VDC
Battery Capacity		650 mAh (Case), 40 mAh Per Earbud
Battery	‎Lithium Polymer
Battery Life	40 hours (With Case)	12 hours (With Case) 3 hours (Earbuds)
Charging Time	1.5 hours (Case)	2 hours (Case)
Stand-by Time		100 hours