Wireless Welcome Doorbell Entry Alarm W/Sensor Voice Prompter Antitheft for Home Store Hotel Conditon: Item Type: Voice Prompter Material: ABS Plastic Color: As Pictures Shown Host Size: Approx. 27 x 20 x 9cm/10.6 x 7.9 x 3.5in Working Current: Sleep State: ≤880μA                             Playback Status: ≤500mA                             Standby State: ≤18.4mAAudio Format: MP3, Bit Rate: 8-320Kbps Audio Output Power: 8Ω/10W (Typical Value) Sensing Range: ≥Approx. 4m/13.1ft Alarm Sound: ≥100dB Bluetooth Effective Distance: ≤Approx. 10m/32.8ft (Barrier-Free)Basic Function:  Button Name Operation Mode Realization Function Status A Button Short Press Volume 6 level loop adjustment None A Button Press the button for 3s start recording with a "di" sound, The red light flashes once Use the phone player for voice recording, Press the short A button again to exit the recording B Button Short Press Next song (can be looped)  None B Button Insert the U disk and press and hold for 3s U disk voice copy  The red indicator light flashes