Purchase tips:? The product supports a maximum trailer tow a 99 or 99. Power specifications to choose from: the regulations, the US regulations, the British regulations, Australia, EU, we default hair "in the regulations." If in doubt please contact customer service! Thank you! Note: This product has a wireless remote lock function, customers need to own 315 models equipped with remote lock. If you do not unlock it, would not have changed the lock. Product Specifications Product Specifications: Product Name: Wireless intercom Product Type: KDB201 Brand: KiVOS / Jin Weishi have power: DC5V / lithium battery 3.7-4.2V Working Current: 100mA Standby current: 1-2mA Frequency: 300-3000Hz launch Power: 16-20dBM Communication distance: 450-500m (open area) Product Features 1, the use of digital public 2.4G ISM band: 2405 ~ 2475MHz, using AFH adaptive frequency hopping technology. 2, the transmission power 16-20dBm, receiver sensitivity -90 ~ -100dBm. 3, the air transfer rate 250K, open communication distance up to about 450-500 meters. 4,100 sets of any two machines can communicate ringing call. 5, full-duplex intercom mode, the volume can be adjusted. 6, outdoor doorbell intercom unit for hands-free mode. 7, remote unlock function (A paragraph is no such function, B models with lock function). 8, LCD display. 9, power supply: DC5V / lithium battery 3.7-4.2V. Shenzhen Hong Electronic Technology Main Range (1) Direct manufacturers: wireless doorbell, doorbell, video intercom, doorbell, home doorbell, doorbell, etc. cat; (2) OEM and abroad enterprises, factories , schools, municipalities, hospitals and other places of security system equipment. Product Service (1) the establishment of a unified national customer service call centers, national holidays have someone on duty. (2) establishment of a national customer profile information management systems, build customer electronic information files to achieve lifelong follow-up. (5) When the customer purchased the Hong electronic products, consumers can be installed according to the instructions, if in doubt you can contact customer service. (4) In order to better understand the Hong electronic products usage, installed in about a week for customer follow up call. (5) year warranty, the product of the National Quality Warranty policy, any quality problems during the warranty period will be free for the customer service, no charge (except consumables). Purchase Notes (1) shop sells products are all new original Original authentic, pictures are taken in kind Nett sales. (2) When ordering products any questions, please contact our customer service staff will give you a satisfactory answer. (3) the buyer after payment delivery within 1-2 days, 3-7 days delivery volume. Under special circumstances will be informed in advance (advance under orders to avoid delays in your delivery time) (4) Our commodity prices are ex-factory price, free shipping, no tax. Logistics default in delivery, other logistics have Nadu, Shen Tong, tact, Jiayi, Sheng Hui and so on. (5) Please check the delivery time buyers line after receipt of goods packaging is intact, if damaged, do not sign, and timely contact with our customer service staff. (6) We do not send samples for free, and if charges as appropriate, please see sample shop commodity prices.