Wireless Portable PA System Specification
Portable Wireless PA Amplifier
BLWA—168

1. The main features 
Use UHF band, little distortion, and strong anti-interference, frequency can be more than 100 and non-interfering. 
Use frequency selecting technology, the transmitter can be adjusted to any frequency band, very flexible. 
Output power: 20W 
Frequency range: 700-860KMHz 
Distortion: <0.5% 
Power supply: AC 220V or DC12V
2. Usage 
For standard classrooms, lecture halls, small hall, class, commentary, meeting 
3. The transmitter 
Work frequency: PLL frequency synthesizer 192 pots (frequency adjustable) 
Work frequency: 700MHz-860MHz (UHF band) 
Frequency stability: ± 20ppm 
S/N: ≥ 100dB 
Distortion: ≤ 0.5% @ 1KHz 
RF power: ≥ 13dBm (20mw) 
Power consumption: 45mA (1.5V)
Effective range: 20m
Battery life: 30 hours (an AAA batteries)

BLT-518A ( NEW PRODUCTS)

1. Features
*The product consists of three parts, the wireless receiving amplifier host, pen-shape transmitting microphone, sound box
* PLL frequency synthesizer mode, automatic checking frequency, easy operation. 
* Can be used in a campus shared hundreds of equipments, without disturbing each other. Pen-shape Microphone is widely used, can work for each host. Low power consumption, an AA battery can support work for 40 hours or more, it can save costs for schools, and meet environmental requirements.

2, the usage
Open the Pen-shape microphone power within a distance of 2 meters (within the frequency distance). It will automatic check frequency after 3 seconds, then it works normally. When microphone takes off for more than 20 seconds, the receiver will automatically enter the auto frequency checking status.
3, the technical parameters
Frequency range: UHF740 ~ 850MHz 
Transmission power: 15mw
Sensitivity: below 3UV
S/N: 90dB
Distortion: 1% (1KHz)
Power consumption: 45mA (1.5V)
Effective range: 20m
Battery life: 30 hours (an AAA batteries)