1. Power supply: 6VDC 2 CR2032 (230mAh) lithium batteries 2. Battery life: about 2 years, calculated based on 10 times per day 3. Operating frequency: 433.92 MHz +/-75KH 4. Transmit power: about 1mW 5. Coding format: HCS301 standard format<br><br>Operating temperature: -10-+55 Number of password digits: 0 to 8 digits Transmit distance: 200 meters in open space; 35 meters indoors Protection level: IP56 Automatic lighting: When the surrounding light is insufficient, the key input signal LED automatically lights up. Automatic standby: When there is no key input signal for 10 consecutive seconds, the system automatically enters the power saving standby state. Buzzer prompt description: Prompt sound State indicated 1 short "beep" Key sound 1 long "beep" Password change successful (or code transmission) 5 short "beeps" Password error or enter the password change state 2 low-pitched "beeps" Battery low voltage alarm Low voltage alarm: When the battery voltage is lower than 4 volts, 2 low-pitched "beeps" are emitted each time the key is released. Colour:As Shown Material:plastic<br><br>Package Contents: 1 * gate door opener<br><br>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.