EWM104-BT57U is a USB to BLE Bluetooth adapter with Bluetooth 5.2 protocol. It is small in size, low in power consumption, and works in the 2.4GHz frequency band. It is used in smart wearables, home automation, home security, personal health care, smart home appliances, accessories and remote controls, automobiles, lighting, industrial Internet, smart data acquisition, smart control, etc.
[Communication interface]：USB
[Operating frequency]：2.4GHz
[Bluetooth protocol]：BLE5.2
[Communication distance]：100m
[Product size]： 18.5*14.5*6.0mm
[Product weight]： 1.7g±0.1g
| Main parameters | Performance | Remark | |||
| Minimum value | Typical values | Maximum value | |||
| Operating voltage (V) | 3.3 | 5 | 5.5 | ≥5.0V can guarantee output power, and if it exceeds 5.5V, the module may be burned permanently | |
| Operating frequency band (MHz) | 2400 | - | 2480 | Supports ISM bands | |
| Transmission power | -20 | - | twenty three | - | |
| Power consumption | Emitting current (mA) | - | 160 | - | Peak transient current @23dBm |
| Receive current (mA) | - | 6.8 | - | - | |
| Receive sensitivity (dBm) | - | -95dbm | - | ||
| Working temperature (℃) | -40 | - | +85 | Industrial design | |
| Main parameters | describe | Remark |
| Reference distance | 220m | Clear and open environment, height 2 meters, 4.5dBm, airspeed 1Mbps |
| Bluetooth protocol | Was 5.2 | - |
| Communication interface | USB | - |
| Product size | 60.0*18.0*8.5mm | ±0.2mm |
| RF interface | PCB onboard antenna | Equivalent impedance is about 50Ω |
| Product weight | 7.5g | ±0.1g |
| Main parameters | Performance | Remark | |
| Minimum value | Maximum value | ||
| Power supply voltage (V) | 0 | 5.5 | More than 5.5V may permanently burn the module |
| Blocking power (dBm) | - | 10 | Low probability of burning when used close to the |
| Working temperature (℃) | -40 | 85 | Industrial grade |
