USD 39.00/pieceUSD 3.98/pieceUSD 5.99/piece
Features：
This small gadgets will alert and warn people stay far away from danger field when it detected smoke. This product named Photoelectric detector (hereinafter called detector) detects the smoke by a couple of infrared diodes. The principle of detecting is granule in the smoke can reflect infrared light. Infrared diodes are placed in the special chamber. The chamber can shield external light, but don’t affect the smoke into it. While have no smoke, the diode can receive very weak infrared light. When the smoke entering the the chamber, diode can receive more and more light, when the smoke attains the certain density, the detector can give out alarm signal. In order to reduce the interference and lower power consumption, the emitting circuit adopts the pulse signal. The detector adopts the special structure design and ASIC, has the dustproof, mothproof and anti outside light interference feature etc. The detector is suitable for detect the smoke in house, shop, hotel, restaurant, office building, school, bank, library, computer house and storehouse etc. Power: 9V battery ( not include) Transmission frequency: 433MHz
Specifics:
100% Brand New. Weight:88g Size:10.5 x 10.5 x 3.5cm Color: White Excellent stability. High sensitivity. Alarm test button for easy testing. Low battery indicator Designed for the fastest possible installation. 
1) We accept Alipay, West Union, TT. All major credit cards are accepted through secure payment processor ESCROW.
2) Payment must be made within 3 days of order.
3) If you can’t checkout immediately after auction close, please wait for a few minutes and retry Payments must be completed within 3 days.
We Ship to Worldwide, except APO/FPO.
Items are shipped from China using Airmail, reach most of the countries within 10 to 20 business days.
Delivery time depends on destination and other factors, it may takes up to 20 business days.
1. You have 7 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! Shipping cost is bear by both seller and buyer in half.
2. All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return, and your po#.
3. We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction from aliexpress. OR, you may choose to have a replacement.
4. We will bear all the shipping cost if the product(s) is (are) not as advertised.
12 months Warranty. Buy with confidence!
If you are not satisfied when you receive your item, please return it within 14 days for a replacement or money back. Please contact me before you return it.
If item is defective in 3 months, We will send you a replacement without extra charger, or offer refund after we receive the defective item.
If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item. But you have to pay the extra shipping fee.
We are not responsible for any custom duty or import tax.
We will leave POSITIVE FEEDBACK after receiving the payment. Please contact us if you are not satisfied with the item after receive it.
All emails will be answered within 1 business day. If you do not receive our reply, please kindly re-sent your email and we will reply to you as soon as possible.
Serious Buyer Only! Please place bid only if you agree with all the terms.
