BWC Core Hardware Technology & Parameter Specification

Created on 06.13

1. Battery System

Battery is the core component determining the endurance and environmental adaptability of BWC. Lithium battery is the mainstream power supply in the industry, which can be divided into conventional lithium battery, low-temperature resistant battery and explosion-proof battery.

1.1 Conventional & Low-temperature Battery

Conventional lithium batteries perform best at room temperature. Low-temperature batteries have a minimum operating temperature of -20℃. When the temperature drops to -30℃, the effective discharge capacity of low-temperature batteries will drop to 70%. There is an inherent technical dilemma: conventional batteries lose efficiency in low temperature, while low-temperature batteries have reduced available capacity at room temperature. The two types cannot take into account both high and low temperature scenarios.

1.2 Explosion-proof Battery

Explosion-proof batteries are classified into general explosion-proof and mining explosion-proof for high-risk scenarios such as mines:

General explosion-proof battery: Adopts pure cobalt material, the capacity is about 70% of conventional batteries in the same volume;
Mining explosion-proof battery: Uses lithium manganate material, the capacity is only 50% of conventional batteries in the same volume due to material limitations.

2. Display Screen & Touch Technology

Most BWC screens are less than 5 inches, and screens under 4 inches are the most common, partial models support touch function. The resolution of touch screen is generally lower than shooting resolution, which cannot fully restore image details.

2.1 Special Touch Requirements

For industrial fields such as medical treatment, chemical industry and electric power, products need to support glove operation (leather, woven gloves) and wet-hand operation.

2.2 Touch Screen Structure

On-Cell: The touch layer is attached to the outside of the LCD. The whole component is thicker, with low light transmittance;
In-Cell: The touch layer is integrated inside the liquid crystal layer. It is thinner with better display effect, but higher cost, and rarely used in mainstream BWCs.

3. Storage & Data Transmission

3.1 Storage Type Comparison

EMMC: Embedded patch storage, non-removable. Features high stability and fast read-write speed, effectively preventing data tampering, which is the preferred solution for law enforcement evidence collection;
TF/SD Card: Removable expandable storage, low cost and easy to replace. Risks of loose contact and low data security exist.

3.2 Data Transmission Speed

Transmission speed is determined by USB interface version, storage medium read-write speed and main control chip performance:

Most mainstream products adopt USB 2.0, with the maximum transmission speed limited within 50MB/s;
High-end 4G/5G BWCs are equipped with USB 3.0, matching EMMC storage to realize fast data export.

4. Charging & Battery Service Life

4.1 Charging Speed

Most BWCs support charging current of 1A~2A (5V) with low power. By upgrading the charging management IC, high-voltage high-current fast charging can be realized (18V/2A~3A, power 30W~50W). Partial 4G/5G models support "5-minute charging for 2-hour use".

4.2 Battery Cycle Life

The cycle life of high-quality lithium batteries is about 500 times. After 500 cycles, the battery capacity will decay to 80% of the initial value. Battery aging is normal loss for long-term use.

5. Wearing Design

BWCs support diversified wearing methods: standard shoulder clip, and adapters for safety helmets, casual hats, selfie sticks, tripods and bicycle brackets. For water-related scenarios, it can be matched with buoys to ensure the device floats on water.Core design principles: accessory compatibility, wearing convenience and comfort.

6. Image Stabilization Technology

Image stabilization is core for dynamic on-site evidence collection:

Electronic Image Stabilization (EIS)
Mechanical Image Stabilization

7. Wireless Connection

Most products adopt 2.4GHz Wi-Fi, with long transmission distance but limited bandwidth;
A few high-end panoramic cameras support dual-band 2.4GHz + 5.8GHz, adapting to high-bit-rate video transmission.
Non-intelligent BWCs use passive Bluetooth (controlled by remote controller); intelligent models support active Bluetooth to connect remote devices actively.

8. Audio Components

Microphone: Standard single microphone for basic models; dual microphones with noise reduction algorithm for intelligent models;
Speaker: 1W for ordinary models, 2W for high-end models, 3W for intercom & BWC integrated devices. The speaker is designed for high-pitch sound to ensure clear voice in noisy environments (non-stereo).

9. Lens & Night Vision Technology

9.1 Night Vision

Infrared Night Vision: Mature technology, realizes black-and-white night vision by infrared fill light and filter switching;
Full-color Night Vision: No infrared light required, generates color images in low light via high-sensitivity sensor. Disadvantages: extremely high power consumption, cannot be turned off, seriously affects battery life;
Starlight Night Vision: Most products claiming starlight night vision are enhanced low-light imaging, which still relies on weak ambient light.

9.2 Lens Design

Main cameras adopt fixed-focus lens by default, with clear shooting range starting from 1 meter (blurry within 0.5~1 meter). Fixed-focus design simplifies structure and reduces cost, matching medium and long-distance shooting of law enforcement scenarios.Auto-focus / zoom lens is not adopted: it is suitable for close-range selfies, hard to focus on distant targets, and will increase power consumption and structural complexity.

10. Supplementary Knowledge: EMMC & RAM

RAM (Running Memory): For temporary operation of the main control chip, data will be lost after power off;
EMMC (Storage Memory): For long-term storage of video, audio and files;
Common marking: "2+8 / 4+64", the former stands for RAM, the latter stands for EMMC storage.

Suzy