21 Keys Infrared Remote Control 8m - 10m For XIAOMI / COSHIP/ INSPUR Set Top Box

Infrared Remote Control With 21 Keys For XIAOMI/ COSHIP/ INSPUR/GOSBELL/ NEWLAND Set Top Box

Our 21keys infrared remote control use good quality infrared chipset . why ?? Cause The emission intensity of the infrared transmiter varies with the emission direction. When the direction angle is zero, the radiation intensity is defined as 100%. When the direction angle is larger, the radiation intensity is relatively reduced. If the emission intensity is taken as half of the direction angle by the optical axis, the value is half of the peak value. This angle is called the direction half value angle. The smaller the angle is, the more sensitive the directivity of the element is. Generally, infrared light emitting diodes are attached with lenses to make their directivity more sensitive
When transmitting infrared to control the corresponding controlled device, the control distance is proportional to the transmitting power. In order to increase the infrared control distance, the infrared transmiter works in the pulse state, because the effective transmission distance of the pulse light (modulated light) is proportional to the peak current of the pulse, and the emission distance of the infrared light can be increased by increasing the peak IP as far as possible. The way to improve IP is to reduce the duty cycle of the pulse, that is, to compress the pulse width t. Generally, its frequency is below 300kHz

This IR remote control is fit for human hand hold : the back case top part is slim , the down part is thicker . two AAA batteries offer your remote control continue power . The middle guide direction part allow user change the channel and voice