1. Charging:
- Battery capacity: 35mAh for headset, 480mAh for charging case
- Charging port: Type-C/USB-C
- Headphone input parameter: 5V 0.11A
- Charging case input parameter: 5V 1.2A
- Charging box output parameters: 5V 0.22A
2. Range:
- Music playback time (AAC encoding, default setting, 50% volume)
- Noise cancellation off long range: 30h (headphones + charging box)
- Noise canceling off short range: 6h
- Noise cancellation on long battery life: 20h (headphones + charging case)
3. Connections:
- Wireless connection: Bluetooth
- Bluetooth protocol: HFP / A2DP / AVRCP
- Bluetooth version: BT5.3
- Bluetooth codec: AAC / SBC / LHDC (some models support)
- Working distance: 10m (unobstructed open environment)
4. Protection level:
- Headset: IP54
- Charging box: IPX4
5. Size, weight:
- Monaural weight: 4.4g
- Monaural size: 18.62 x 30.68 x 19.70mm
- Charging case weight: 37.65g
- Charging case size: 50.90 x 58.09 x 26.98mm

Features:
1. Comfortable half in-ear, close to the ear curve, intelligent active noise reduction, balanced ear pressure
2. Built-in 3 microphones with AI noise cancellation
3. Independent audio space
4. Graphene diaphragm, fast response, high rigidity, dual magnetic units bring high dynamic amplitude, reduce distortion
5. 60 degree angle design, reasonable weight ratio, so that the center of gravity falls on the in-ear part, wear more stable
6. O-ring design, rich ventilation holes, the cavity membrane vibration more fully
7. Lightweight design, delicate and compact, light and comfortable to wear, open magnetic absorption
8. Dynamic adaptive EQ compensation
9. Support LHDC5.0 ultra-clear transmission protocol, sampling rate up to 192kHz, with 6 times the detail of the CD, with ultra-high definition audio, low distortion, through the Hi-Res Audio Wireless certification

Packing list:
- Xiaomi Buds 4 x 1
- Charging case x 1
- Charging cable x 1
- User manual x 1