Features: 2.4GHz digital wireless transmission, stable transmission signal. Built-in MIC and speaker for one-way audio monitoring, with nightlight function. High sensitivity, the crying voice is easy to be heard and to inform parents. Adopt frequency hopping spread spectrun (FHSS), Anti-interference and sound clarity Position the transmitter at a distance of about 1.5-2.0 meters from the baby. Open space transmission range up to 250M. Specifications: Transmission Frequency: Ism 2400-2480MHz Transmission Power: 17dBm Modulation Type: Power Supply: Built-in lithium battery Operating Temperature range: -10~+60 Storage Temperature: -40~+70 Material: plastic colour: White Package Contents: 1 x Transmitter 1 x Receiver 2 Cable 1 x User Manual (English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!