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: FSK
Power Supply: Built-in lithium battery
Operating Temperature range: -10°~+60°
Storage Temperature: -40°~+70°
Material: plastic
Baby Unit: 13 * 9.7 * 3.5cm
Parent Unit: 13 * 9.7 * 3.5cm
Package Size: 14 * 10.5 * 10cm / 5.5 * 4.1 * 3.9in
Package Weight: 212g / 7.5oz

Package List:
1 * Transmitter
1 * Receiver
2 * Power Cable
1 * User Manual (English)